Integrate master into develop branch

Also, added support for normals on models

Edited to better accomodate to multiple platforms

Added first version of OS X compilation support
Some conflicts manually resolved...

Integration from develop branch

Corrected some bugs on the way...
Automatically convert textures to POT on RPI and WEB

[models] Added DrawQuad()

Added PLATFORM_WEB support (emscripten-webgl)
[audio] Added LoadSoundFromWave()
[textures] Added LoadTextureFromImage() to replace CreateTexture()
Some TraceLogs edited...

[core] Added SetMousePosition()
[models] LoadHeightmap() - Corrected textures bug
[raymath] Functions renaming
[WEB] Prepare environment for emscripten!

This reverts commit 29d8b48503.

[core] Added SetMousePosition()
[models] LoadHeightmap() - Corrected textures bug
[raymath] Functions renaming
[WEB] Prepare environment for emscripten!

Develop branch integration

Populate master changes to develop branch

Small fixes to support the Debian/GNU Linux distro. Hopefully Ubuntu too.

Fixed WAV loading under 64-bit systems.

View CHANGELOG for description on small fixes and add-ons