Finish 19 with improved and spread into 2 sub-sample

2 sub-sample taking into account both joystick and game controller
sub-system. Each of both has subtle APIs to deal with in code.

19_gamepadsAndJoysticks/.gitignore
19_gamepadsAndJoysticks/LButton.c
19_gamepadsAndJoysticks/LButton.h
19_gamepadsAndJoysticks/LTexture.c
19_gamepadsAndJoysticks/LTexture.h
19_gamepadsAndJoysticks/Makefile
19_gamepadsAndJoysticks/README.md
19_gamepadsAndJoysticks/arrow.png
19_gamepadsAndJoysticks/common.c
19_gamepadsAndJoysticks/common.h
19_gamepadsAndJoysticks/controllers.c
19_gamepadsAndJoysticks/joysticks.c