Add initial support for sound
Add missing files
Build sound support for android only, for now
Error handling in audio player creation
Merge branch 'master' of https://github.com/remogatto/gorgasm

Conflicts:
	sound.go
	sound_android.go
	test/src/testlib/tests.go
Changes in the resource loader:

* Add ReadResource helper function
* AssetsPath now points to res/ folder
Rename AssetManager in ResourceManager
Fix test build
New sound support implementation (via buffer queue players)
Add dummy sound support for desktop