sin(), cos() functions cached and replaced by float c99 versions sinf(),
cos()

...and improved mouse gestures support
Some testing still required...

Those games have been developed by students and ported to a common base
template. Some of them still require some review to be consistent with
each other (formatting, variables naming, code structure...)

Disable cursor feature

Fix shader versions

Fix raylib compiling on Linux

Required by ProcessGestureEvent()

Mouse input is interpreted as touches to allow mouse gestures
detection... and get an unified inputs system for all platforms!

Fixed hold gesture detection

- Fixed gestures hold detection.
- Improved hold state detection for little touch position increments
(sensitivity).

Removed GLEW external dependency, now it works with GLAD
Kept GLEW path, just in case... detected weird behaviour when testing
with gDEBugger

Added ray-sphere collision detection

This reverts commit 423a45ac85.

Added support for single header implementation and also inline functions
support

- Added simple ray-sphere collision detection.
- Added extra function with extended parameters to obtain collision
point vector.
- Fixed bounding box calculations init values (were causing compiling
errors).

standalone raymath

look over for errors

Moved building information to raylib github Wiki page

Reviewed vertex type variables