Now `BeginTextureMode()` does not clean buffers automatically, that behaviour has been changed because there could be some case (i.e. painting software) where texture buffer does not ned to be cleared; user is responsible of clearing buffers using `ClearBackground()`

- Preparing MP3 files support
- Jumped version to raylib 2.0-dev (too many breaking changes...)

Now works in WEB!

Related to UpdateMusicStream(), in stb_vorbis

Render wave in a render target
Implemented combo system
Removed big useless audio (fxWave)