Develop branch integration

# Conflicts:
#	src/gestures.c
#	src/makefile

Using normalized [0..1] input points

A deeper revision required, not clear enough for the user
Key: Create a PhysicObjects pool

Most of this code was developed by students, it requires some additional
review to be used for teaching.

This game was developed for King GameJam 2015

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!