Replaced old GetExtension() function
Make IsFileExtension() public to the API

Working in modules configuration flags...

Also reviewed issue with stdbool when compiling with clang

Useful to set number of repeats for a music, needs to be tested...

- Renamed WritePNG() to SavePNG() for consistency with other file
loading functions
- Renamed WriteBitmap() to SaveBMP() for consistency with other file
loading functions
- Redesigned SaveBMP() to use stb_image_write

The function means to accept a const * so let's declare it.
Will allow passing const buffers in games.
Also constness is next to godliness!

Signed-off-by: Saggi Mizrahi <saggi@mizrahi.cc>

Samples count was not properly calculated on WAV loading

Start removing old rRES functions.

Correcting details that pop-up when testing the different platforms

raylib uses spaces between '+' and '-' signs but not between '*' and '/'
signs, it's a chosen convention

- LoadWave()
- LoadWaveEx()
- UnloadWave()
- WaveFormat()
- WaveCopy()
- WaveCrop()
- GetWaveData()

Simplified module for Music and AudioStream
Added support for raw audio streaming (with example)