update CubeScript

Complete Changelog
* Corrected deliminators to reflect CubeScript's quirks.
* Highlight all operators
* Added additional valid key names for mouse buttons.
* Split enclosed lookup types so they do proper bracket mismatching checks
* Adjusted style of $() lookup construct to reflect its executable nature.
* Include standard Alert types in the comment context.

* Fix file extension for identifying CubeScript files.
* Fix highlighting of reserved aliases outside an enclosed lookup.
* Fix Bind context possibly marking ) and ] characters as erroneous.

Thanks to Kevin Meyer for the patch!