[SVN] Punctuation Scope

[Michael Sheets]

> It's mainly to give people something to scope punctuation as, right  
> now there isn't anything and people have been doing really odd  
> things. Some of the punctuation is keyword.* for instance. I think  
> the biggest uses of the scope will be snippets; having something  
> special happen when beside x for instance.

Forgot one of my other ideas for this… ties in with a scope selector  
idea I've been mulling over in my head.

Would be cool if we had a way to reverse the caret direction of the  
selector, ie: match the scope before the caret. Basically akin to a  
look-behind.

With that we could have a scope selector of "punc.delim.func.ending (? 
<=punc.delim.func.ending)" to have a snippet overload return inside  
an empty {}. Someone recently pointed out that this is hard coded  
into TM, would fix that. Could get rid of some of the special empty  
matches and wacky meta scopes we have for things like this.

(Not suggesting the above look-back syntax, just a dirty example)