MRI-Binding: Optimize attribute setters
FileSystem: Remove useless code
BltShader: More hacks! Yay!

Seriously, I'm about to kill myself over this..
Not even gonna bother with math-if optimization.
Add a very crude screenshot function (press F3)

Files are named after the current date+time (down to seconds),
and written to the gameFolder directory.
MRI-Binding: Deduplicate code
MRI-Binding: Optimize RB_ARG_END vaarg guard

It's enough to check this only in debug mode.
Make this an empty define in release mode.