object-literal-sort-keys: rewrite, handle spread and shorthand

[ajafff]

PR checklist

• Addresses an existing issue: object-literal-sort-keys is nearly (but not quite) alphabetic #1924, object-literal-shorthand disables object-literal-sort-keys #2205, object-literal-sort-keys does not handle spreads well #2554
• New feature, bugfix, or enhancement
  • Includes tests
• Documentation update

Overview of change:

[new-rule-option] object-literal-sort-keys adds ignore-case
Fixes: #1924
[enhancement] object-literal-sort-keys: check shorthand properties
Fixes: #2205
[bugfix] object-literal-sort-keys: handle object spread correctly
Fixes: #2554

Is there anything you'd like reviewers to focus on?

Numbers are still excluded because it doesn't make sense to sort them alphabetically.
Methods and accessors are also still ignored.

[adidahiya]

needs conflict resolution

[ajafff]

@adidahiya rebased and resolved conflicts.
Now I have a problem with no-unsafe-any and labels. That seems to be resolved with the latest version of the rule, but the one in tslint@latest doesn't like my code

[ajafff]

@adidahiya @nchen63 CI is green now that tslint@5.2 is released. This should be good to go