Pi Day Update

If you didn't know, 3/14 is Pi Day. It's pretty cool, you celebrate by eating pie

Anyway, here's the changelog:

• Discord Rich Presence support
• Normal V3 importing support
• New Ctrl + RightClick shortcut (Delete all cells of type)
• Physical Generators temporarily removed from editor
• More cheat codes and splashes
  
• SHA256 encoding for cheat codes in source code
• Option to change player controls to IJKL
• Esc shortcuts for 'Menu' and 'Back' buttons
• Cell names are now displayed further down