- Review RPI compilation (core_drop_files not supported)
- Review ImageFormat(), some issues
- GetTextureData() reviewed for RPI

Corrected issue with RPI_CROSS_COMPILE

Improve second option to retrieve texture data from fbo...

Still requires some testing...

...while reviewing GetTextureData() functionality on OpenGL ES 2.0

- Added new function: GenImageColor()

ImageDraw() should be reviewed... specially alpha blending...

To be more generic and configurable

Variable t was read and modified without interleaving sequence points,
technically undefined behavior. Report by Clang's -Wunsequenced

It should be reviewed more carefully...

Requires some work, distortion shader could be move out of raylib to
example code...

Added: DrawRectangleGradientV()
Added: DrawRectangleGradientH()

Increment raylib version and so lib version number.

to emulate OpenGL funcionality

SetWindowTitle()
GetExtension()

Moved function DrawRectangleT() from text module to shapes
Added some comments

Some people might find this handly

On DDS files mipmapCount header parameter could be unused and set to 0,
resulting in a wrong mipmap count and wrong compressed texture loading.