Corrected issue with RPI_CROSS_COMPILE

Added support FreeBSD

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

Still requires some testing...

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

Hopefully new videos comming soon...

- Added new function: GenImageColor()

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

Now it works! :)

Integrate Develop branch

Integrate Develop branch

Integrate Develop branch

To be more generic and configurable

...and reviewed some details

It seems there are some platform-dependant issues

mingw32 libraries provided were compiled with a different GCC version
(different computer) and seemed to be incompatible on linkage (missing
symbols).

- Removed useless templates
- Reviewed all Makefiles
- Rework some code for Android support
- Added resources to advance template