Actually, renamed ReadTextFile() from rlgl and make it public

Function names, code formatting...

First version of custom raylib resources file format -IN DEVELOPMENT-

- Improved ImageCopy() to support compressed formats
- Renaming file-formats header structs for consistency
- Review variables naming on ImageDither() for consistency
- Improved LoadImagePro() to make a copy of data
- Preliminary support of rRES file format on LoadImage()

- 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

Feature NOT TESTED yet...

Removed: LoadTextureEx()
Added: LoadImagePro()

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

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

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.

log2() is not available in some standard C library implementations

Replaced LUA by Lua

texture.mipmaps value needs to be updated, so, texture must be passed by
reference instead of by value

Mask was wrongly applied to 8-bit font image, it generated dark borders
on the font. Grayscale image has to be considered as the alpha mask for
a completely white image to use it correctly.

Functions that need to manage big data arrays don't work properly, that
functionality should be reviewed...

Updated to raylib 1.6 functionality

Correcting details that pop-up when testing the different platforms