Code Cleanup: avoid duplicate calls to WM_window_pixels_x/y
Rigidbody: Remove keyboard shortcuts to add/remove bodies

We had several reports where users would create rigid bodies by accident
and then wonder why transformations behave differently.
Since these actions aren't used that often, just remove the shortcuts.
Fix build issues with mingw's
Fix uninitialised var warning
Whitespace/Style fix
Code cleanup - Commented out some code which wasn't actually doing anything

gpf->framenum is an int, not a float. Hence, this type of rounding has no effect.
Math Lib: add iroundf function for: (int)floorf(a + 0.5f)
Code Cleanup: float/double promotions
Code Cleanup: use iroundf

also increase precision of rctf print functions
Fix T38207: Tab scale jitters when resizing region