If we compile with c99 without gnu extensions (gnu99) we need this
define, to have CLOCK_MONOTONIC and similar macros available

Reviewed some Vector3 functions
Added auxiliary Clamp() function

Working in modules configuration flags...

Required by gestures example....

Use instead: IsGestureDetected()

Using normalized [0..1] input points

Corrected Android processing for some inputs (BACK button, VOLUME
buttons)
Redesigned Gestures system (some work still required)
SetEnabledGestures() - Only support desired gestures (requires some
review)

Now gestures system can be used as standalone module