Update 2.1.2 - A 'Cursory' Update

This update will help keep your pointer in your pants... or window... or whatever.

• The cursor will now become invisible if any button is pressed. Now you don't have to move it offscreen!
  
• You can now choose whether to use STS's cursor or the system default. - go to "Options", "Controls", and tick the "Use System Cursor" box at the bottom of the screen. I remember I thought it was so cool when I first implemented that custom cursor, but I realize now that some people might have their own cursors they'd want to use, whether for fun or for usability/accessibility.
  
• You can now manually stretch the window size. This was originally prevented for the sake of keeping the graphics on nice multiples, but I figure if you want to stretch it you should be able to - you can always reset it by going to the Window Size option in the options menu.
  

I got the opportunity to test STS out on the Steam Deck when my bro brought it over, and everything seems to be working just fine - but the cursor staying on the screen caught my eye, and I realized there was yet more work to be done, so here we are.

Let me know if you encounter any bugs or anything else that should be fixed up! Thanks for playing!