Completely removes the mouse pointer image

[blubberdiblub]

This is especially bad under Linux, as there's no way to get the mouse pointer image back unless you quit the game, making it impossible to do anything else while playing the game, like browsing through the manual or chatting or whatever.

Under Windows, you can get it back if you somehow manage to switch to a different program (say by alt-tabbing or by managing to click a different window without seeing the pointer), but it's still bad enough.

Ideally, the invisible mouse pointer image should just be set on the game window (even in fullscreen mode there should be a virtual game window where you can set a mouse pointer image on) and let the OS manage the rest (i. e. when and where it gets blanked).

[Spaceman1701]

I think this is an easy fix. I'll try to fix this in the post-jam branch when I get a chance.