Add support for brace/paren matching

[rkeithhill]

I would imagine this to work like it does in VS or ISE. Key-binding could be Ctrl+]. It would match both curly braces and parens which PowerShell command lines can be heavy with. An additional option here might be to match quotes as well since it can be confusing sometimes which double quote matches another and same for single quote.

[lzybkr]

Fixed. 52e9083

I didn't add anything for matching quotes. I agree it seems like a good idea, but no editor I use does that, so for consistency I decided to not implement it.

Note that ForwardWord/BackwardWord/EmacsForwardWord/EmacsBackwardWord isn't quite like other shells, it moves roughly by token, so it sort of already is like quote matching.