Enabled Shader Support (Fixed ColorTransforms)

I *finally* figured out how to enable shaders in Haxe/NME on native
targets. Now, ColorTransforms and other features work as expected in
windows, linux and mac.
Added Plugin Features

The new plugin features allow you to register new types and import
scripts, add new map editing tools and modify the menus and toolbars.
Also fixed some bugs, added jhlabs image manipulation/filters (along
with a color matrix and transformation filter) and added support to play
sounds in neko.