fix TTF parsing bugs (#579)

* ttf: support version 0.5 of "maxp" table (used by fonts with CFF
outlines)

* ttf: do not try to read data outside of the stream of "post" table,
fixes #351

* ttf: version10 -> is_version10

font/ttf.ksy

@@ -824,6 +824,14 @@ types:
       - id: num_glyphs
         type: u2
         doc: 'The number of glyphs in the font.'
+      - id: version10_body
+        type: maxp_version10_body
+        if: is_version10
+    instances:
+      is_version10:
+        value: table_version_number.major == 1 and table_version_number.minor == 0
+  maxp_version10_body:
+    seq:
       - id: max_points
         type: u2
         doc: 'Maximum points in a non-composite glyph.'
@@ -887,7 +895,7 @@ types:
           - id: glyph_names
             type: pascal_string
             repeat: until
-            repeat-until: _.length == 0
+            repeat-until: _.length == 0 or _io.eof
     seq:
       - id: format
         type: fixed