[core] Fix some mouse issues on SDL

[ghost]

Fixes

1. Fixes the mouse wheel getting stucked scrolling up or down by adding the missing reset (R534-R536).

2. Fixes the mouse sensitivity being really high on 3D by adding the missing previous mouse position registry (R538-R539).

3. Fixes the mouse button presses not working properly by adding the missing previous mouse button registry (R561-R562) and by adding handling for SDL_MOUSEBUTTONUP (R619-R622).
   .
   VERY IMPORTANT NOTE: @raysan5
   The SDL2 mouse button order is LEFT, MIDDLE, RIGHT, ... (doc), but we currently use LEFT, RIGHT, MIDDLE, ... (L674-L676), so, when the migration to SDL2 is complete, that MouseButton enum on raylib.h needs to be adjusted. Until then, the middle and right mouse binds will be inverted.

Reference

Items 1, 2, 6 of #3313 (comment).

Environment

Tested this changes successfully on Linux (Ubuntu 22.04 64-bit, gcc 11.2.0) with SDL2 (2.28.4).

Edits

1: added line marks.
2: added another fix, environment, formatting.
3: added another fix.

[raysan5]

@ubkp thank you very much for the review! Good catch the mouse button order! Yes, it should be reviewed, not sure if it follows glfw order...

[ghost]

@raysan5 Checked it here and GLFW does indeed use LEFT, RIGHT, MIDDLE, ... (doc). I'd suggest not flipping them yet on MouseButton enum to not cause issues for anyone using current master branch. I can keep track here to remind this when the times comes, if you want.

[raysan5]

@ubkp I see, probably the remap should be done on input polling then. Feel free to add a TODO in the code to remember it!