Port of IOCCC 98 Banks' Flight Sim to WASM-4

Play the game here https://jzeiber.github.io/wasm4-ioccc98flightsim/bundle/

• Direction buttons - flight controls / up/down in menu / move around in map view
• Button 1 - throttle up / select in menu / zoom out in map view
• Button 2 - throttle down / zoom in in map view
• Button 1 + Button 2 - exit flight mode back to menu, or exit map view back to flight mode
• Button 1 + Down - view map while in flight mode