[rcore] Fix IsMouseButtonUp() and add touch events for PLATFORM_DESKTOP_SDL

[ghost]

Changes

1. Fixes IsMouseButtonUp() for PLATFORM_DESKTOP_SDL by adding the missing handling for CORE.Input.Touch.currentTouchState[] on the SDL_MOUSEBUTTONDOWN (R1142) and SDL_MOUSEBUTTONUP (R1156) event cases on PollInputEvents() on platforms/rcore_desktop_sdl.c.

2. Adds SDL_FINGERDOWN, SDL_FINGERUP and SDL_FINGERMOTION event cases basic handling (R1185-R1208) for PLATFORM_DESKTOP_SDL.
   Note: these cases need to be reviewed on a real touch screen.

Credit

• Issue found by @Bigfoot71 at [core] Problem with IsMouseButtonUp which always returns true #3606.
  Very good catch, great job!

Reference

• This is a complementary fix for [core] Problem with IsMouseButtonUp which always returns true #3606,
  since it also affects PLATFORM_DESKTOP_SDL.

Environment

• Tested on Linux (Mint 21.1 64-bit) with SDL2 (2.28.4).

Edits

• 1: added line marks.
• 2: updated line marks.

[raysan5]

@ubkp Oh! This is really a good catch! I didn't noticed it! Actually I'm not sure if I ever used IsMouseButtonUp()...

Thank you very much for the review and the further improvement with the SDL events!

[ghost]

@raysan5 All credits really should go to @Bigfoot71 for finding such a subtle bug. Incredible attention to detail, kudos. 👍