Port the Omni example

[PPKFS]

I mostly ported the main menu and the speed example just to check if there was a huge slowdown in the FFI bindings (spoilers: basically none)..but when I then split out the toolkit window handling I commented out the first terminalSet.

However it could be great to port the rest of the examples because then we would know for sure if all the annoying fiddly functionality is present.

• Basic output
• Default font
• Tilesets
• Sprites
• Manual cellsize
• Auto-generated tileset
• Multiple fonts
• Text alignment
• Formatted log
• Layers
• Extended 1: basics
• Extended 2: inter-layer animation (is this doable? it's commented out in the original)
• Extended 2: smooth scroll
• Dynamic sprites
• Speed
• Input 1: keyboard
• Input 2: mouse
• Input 3: text input
• Input 4: filtering
• Window resizing
• Examining cell contents