Version 0.7.17.0 - Day / Night Cycle Update

Version 0.7.17.0 - Day / Night Cycle Update - Patch Notes:

• added day / night cycle and controls to alter simulation speed
  
• added real time lighting / shadow changes according to relative sun position, including daily shadow traversal, and yearly change in shadow pitch / length due to planet declination
  
• rearranged UI elements to optimize visibility of the game world
  
• fixed bounding sphere of structure models to prevent visibility glitches at certain zoom levels and view angles
  
• improved load time of full city