Adding MGFX to new content pipeline.
Merge branch 'mgfxreflect' into effect
Added CompiledEffectContentWriter.
EffectImporter now sets the ContentIdentity.
Merge pull request #1869 from SickheadGames/effect

Add MGFX To New Content Pipeline
Preemptively resolve my own upcoming audio merge.
Merge branch 'develop' of git://github.com/mono/MonoGame into monogame-sdl2