* Example for creating balls with simple physics simulation

The goal of this example is to create several colored balls whose movement is simulated and which respond to the action of being grabbed and dragged using the mouse.

* renaming example

renaming example from physics_bouncing_balls to shapes_ball_physics

* Added source alpha multiplier for text inline styling examples

* Added header description about base alpha multiplier

* [examples] rewind and forward lines drawing

* [examples] reset button

* [examples] update screenshot

* [examples] applied raylib convention

New platform backend for software rendering directly on RAM memory buffer

Now it goes from -1.0 (full left) to 1.0 (full right) being 0.0 center