Support annotations in type and function definitions

[ergl]

Related to ponylang/pony-tutorial#495, this should fix the syntax highlighting issues for Pony code in Github when using the \nodoc\ annotation.

One caveat of the proposed solution is that it doesn't support multiple annotations, like so:

class \nodoc, nosupertype\ Foo

I didn't find an easy way to write a regular expression that matches a comma-separated list without using capture groups, which doesn't seem to be supported by Sublime's regex engine.

[SeanTAllen]

How does this fix in GitHub? This is the sublime extension.

[ergl]

@SeanTAllen The list of language grammars that Github uses for syntax highlighting is here: https://github.com/github/linguist/blob/master/vendor/README.md

You can see that for Pony they're using https://github.com/CausalityLtd/sublime-pony, which redirects here.

[SeanTAllen]

Well how about that.

[SeanTAllen]

Seems like a reasonable improvement.