Catch-up C++ samples (screen joystick support for lua and AngelScript)

Note that samples using left mouse click on desktop (8,11,13,15...) won't work as expected with touch emulation. Also there seems to be an issue with TouchEnd event as touches are sometimes still detected while left mouse button is up (don't think it's related to scripts).

Simply pass '-touch' to the player's command-line to test on desktop.