SCANsat Development Version 17.5

• Implement day/night map terminator overlays for all maps
  - Toggled with a new icon showing a sun and moon
  - Shows the sun coverage at the time of map reset
• Implement map fill cheat options
  - Allow for selecting specific data types to fill in
  - Data types apply to map reset as well
  - Must set "CheatMapFill = True" in the settings file
• Fix some UI draw order problems with the NavBall
• Fix a potential error that would prevent the big map from closing
• Fix various UI update and synchronization problems
• Various minor UI updates