[YAML] Add entirely new YAML syntax

YAML/preview.yaml

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+%YAML 1.2
+%TAG !e! tag:example.com,2000:app/ # comment
+%RESERVED name parameter #comment
+---
+- [~, null, Null, NULL, nUll,
+   yes, no, true, false,
+   0b0, +0b1_0_1, -0b1, ~, 0b, 0b2,
+   01, +0_761, -07, ~, 09,
+   0, +1, -12_345,
+   0x0, +0x12_34_56, -0xabcdef, ~, 0xyz, 0x,
+   1:20, +1:9, -1_234:59:00, ~, 1:60, :60,
+   0.1, +.293, -1_123.e-3, 2.234.567,
+   .inf, +.INF, -.Inf, .nan, ~, .inF,
+   .NaN, ~, .Nan,
+   2015-08-15, 2015-08-15 1:20:30.123, 2015-08-15T12:20:30.123-9:00,
+   plain scalar, 'single-quoted ('''') scalar', "double-quoted (\"\") scalar"
+  ]
+
+- &anchor !!omap
+  - 1: a
+  - 2: b
+  - foo: bar
+
+- !!pairs
+  - 0: {<<: *anchor, 2: c}
+  - 1: a2 [also part of the plain scalar]
+  - 2: :another scalar {}
+  - !e!float 3: !<tag:example.com,2000:app/int> 1 - 3
+
+- {? !!int '12' : value,
+   ? !!str foo : :bar}
+
+- - key: {more key: baz}
+    asdf: ~
+
+    ? |-
+      block scalar as key
+    # comment here
+    : !!str >5
+      block scalar as value
+...

YAML/tests/syntax_test_block.yaml

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+# SYNTAX TEST "Packages/YAML/YAML.sublime-syntax"
+# <- source.yaml comment
+
+# http://yaml.org/spec/1.2/spec.html#style/block/
+
+
+##############################################################################
+## Scalars
+# http://yaml.org/spec/1.2/spec.html#style/block/scalar
+
+# Headers ############################
+# (note that block scalars may be empty)
+- |
+# ^ punctuation.definition.block.scalar.literal
+
+- >
+# ^ punctuation.definition.block.scalar.folded
+
+- >1
+# ^ punctuation.definition.block.scalar
+#  ^ constant.numeric.indentation-indicator
+
+- |1-
+# ^ punctuation.definition.block.scalar
+#  ^ constant.numeric.indentation-indicator
+#   ^ support.other
+
+# Headers and content ################
+- |
+ literal
+#^^^^^^^ string.unquoted.block
+
+- >1
+  folded
+#^^^^^^^ string.unquoted.block
+
+- |+
+ keep
+#^^^^ string.unquoted.block
+
+- >1-
+  strip
+#^^^^^^ string.unquoted.block
+
+- >
+  content
+   # still content
+#^^^^^^^^^^^^^^^^^ string.unquoted.block
+
+- >
+  # content
+   # still content
+ # not content
+#^^^^^^^^^^^^^ comment
+
+# Empty blocks #######################
+- > asdf
+#  ^^^^^ invalid.illegal.expected-comment-or-newline
+- ># not comment
+#  ^^^^^^^^^^^^^ invalid.illegal.expected-comment-or-newline
+- |
+plain
+# <- -string.unquoted.block
+
+
+##############################################################################
+## Sequence
+# http://yaml.org/spec/1.2/spec.html#style/block/sequence
+
+-
+# <- punctuation.definition.block.sequence.item
+- -
+# <- punctuation.definition.block.sequence.item
+# ^ punctuation.definition.block.sequence.item
+- !!omap -
+# <- punctuation.definition.block.sequence.item
+#        ^ punctuation.definition.block.sequence.item
+-
+
+
+##############################################################################
+## Mapping
+# http://yaml.org/spec/1.2/spec.html#style/block/mapping
+
+key: value
+#^^        string.unquoted.plain.out entity.name.tag
+#  ^       punctuation.separator.mapping.key-value, -entity
+#    ^^^^^ string.unquoted.plain.out
+key#  :  value
+#^^^           string.unquoted.plain.out entity.name.tag
+#   ^          -string
+#     ^        punctuation.separator.mapping.key-value
+#        ^^^^^ string.unquoted.plain.out
+:
+# <- punctuation.separator.mapping.key-value
+
+_type_null: (?:null|Null|NULL|~) # http://yaml.org/type/null.html
+#^^^^^^^^^                         entity.name.tag
+#           ^^^^^^^^^^^^^^^^^^^^   -entity.name.tag
+#                                ^ comment
+
+? explicit key # Empty value
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.block-mapping
+# ^^^^^^^^^^^^               string.unquoted.plain.out
+#              ^^^^^^^^^^^^^ comment
+# <- meta.block-mapping punctuation.definition.key-value.begin
+
+? |
+  block key
+# ^^^^^^^^^ meta.block-mapping string.unquoted.block
+# ^^^^^^^^^ -meta.block-mapping meta.block-mapping
+: - one # Explicit compact
+# <- meta.block-mapping punctuation.separator.mapping.key-value
+  - two: :three # block value
+# ^ punctuation.definition.block.sequence
+#   ^^^ string.unquoted.plain.out entity.name.tag
+#      ^ punctuation.separator.mapping.key-value
+#        ^^^^^^ string.unquoted.plain.out
+
+? a key : not a value
+#       ^ meta.block-mapping invalid.illegal.expected-newline
+
+scalar
+# <- -meta.block-mapping

YAML/tests/syntax_test_directives.yaml

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+# SYNTAX TEST "Packages/YAML/YAML.sublime-syntax"
+# <- source.yaml comment
+
+# http://yaml.org/spec/1.2/spec.html#directive//
+
+
+##############################################################################
+## YAML DIRECTIVE
+# http://yaml.org/spec/1.2/spec.html#directive/YAML/
+
+%YAML 1.2
+#^^^^     keyword.other.directive.yaml
+#     ^^^ constant.numeric.yaml-version
+# <- meta.directive punctuation.definition.directive.begin
+%YAML 9821.2213213 # comment
+#     ^^^^^^^^^^^^   constant.numeric.yaml-version
+#                  ^ comment
+%YAML 9821.2213213 more
+#                  ^^^^ invalid.illegal
+
+
+##############################################################################
+## TAG DIRECTIVE
+# http://yaml.org/spec/1.2/spec.html#directive/TAG/
+
+%TAG
+#^^^ meta.directive keyword.other.directive.tag
+# <- meta.directive
+%TAG !
+#^^^ keyword.other.directive.tag
+#    ^ storage.type.tag-handle
+%TAG ! tag:example.com,2000:app/
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.directive
+#^^^                             keyword.other.directive.tag
+#    ^                           storage.type.tag-handle
+#      ^^^^^^^^^^^^^^^^^^^^^^^^^ support.type.tag-prefix
+%TAG !! tag:example.com,2000:app/
+#    ^^   storage.type.tag-handle
+#       ^ support.type.tag-prefix
+%TAG !e! tag:example.com,2000:app/ # comment
+#    ^^^   storage.type.tag-handle
+#        ^ support.type.tag-prefix
+#                                  ^ comment
+%TAG !e! !empty-
+#    ^^^         storage.type.tag-handle
+#        ^^^^^^^ support.type.tag-prefix
+
+%TAG !tag some text
+#     ^^^ invalid.illegal
+#         ^^^^ invalid.illegal
+#              ^^^^ invalid.illegal
+%TAG !yea-! [
+#    ^^^^^^   storage.type.tag-handle
+#           ^ invalid.illegal
+%TAG !y_ea! [
+#     ^^^^^ invalid.illegal
+%TAG !yea! tag more
+#              ^^^^ invalid.illegal
+%TAG !yea!%%YAML
+#         ^^^^^^ invalid.illegal
+
+
+##############################################################################
+## RESERVED DIRECTIVE
+# http://yaml.org/spec/1.2/spec.html#directive/reserved/
+
+%RESERVED
+#^^^^^^^^ meta.directive support.other.directive.reserved
+# <- meta.directive punctuation.definition.directive.begin
+%1
+#^ support.other.directive.reserved
+%RESERVED name
+#^^^^^^^^ support.other.directive.reserved
+#         ^ string.unquoted.directive-name
+%RESERVED name parameter #comment
+#^^^^^^^^                  support.other.directive.reserved
+#         ^^^^             string.unquoted.directive-name
+#              ^^^^^^^^^   string.unquoted.directive-parameter
+#                        ^ comment
+%RESERVED name parameter#no-comment
+#                       ^^^^^^^^^^^ invalid.illegal
+%RESERVED name parameter more
+#                        ^^^^ invalid.illegal
+
+
+##############################################################################
+## MISC
+
+%
+# <- meta.directive punctuation.definition.directive.begin
+% TAG
+# ^^^ invalid.illegal
+%%
+#^ invalid.illegal