* 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

This redesign stores lines in Update and draws stored lines in Draw, instead of previous approach of drawing directly to framebuffer with no cleaning. This approach allows some interesting features like line draw replay or reversing.

* [examples] Added: `shapes_rlgl_triangle` example

* correct name

* formatting

* Revert "formatting"

This reverts commit f1d246a648.

* Revert "correct name"

This reverts commit 974985ed49.

* Revert "[examples] Added: `shapes_rlgl_triangle` example"

This reverts commit d053b9afa0.

* [examples] Added: `shapes_rlgl_color_wheel` example

* clarify color variable

* formatting

* formatting

* formatting

* formatting

* reduce redundancy

* moved color updating code to update

* Example textures_screen_buffer

* remove resource preload for web makefile

* update description

* code formatting

* [examples] Added: `shapes_rlgl_triangle` example

* correct name

* formatting

As the license for previous bunny was not clear, it was replaced by a new custom bunny specifically created for this example with a CC0 license

* Added models directional billboard example

* add killbot texture

* various fixes and formatting tweaks

* corrected stdlib

* Added sprite stacking example

* added link

* formatting