Alpha 16 Update - combat AI and spy stations

• Began to rework the espionage system
• Now need spy stations to see exact number of ships at enemy planets
• Added a menu for buying spy stations on planets
• Improved the AI, so it can now make proper decisions during ship battles
  • Some of the new features are still disabled due to a lack of testing, but at the very least it can now deal with obstacles better and makes far better decisions when moving/attacking. 
• Started working on new art for planet surfaces to replace the mismatch art that I found on public a few public domain asset pages (1 finished, a dozen more to go)
• Made some other improvements to game systems (update log went missing)
• Fix pinch zoom on mobile
• Added an option for ETA to be shown below the transport ships
• Added in an extra page in the build menu for planet specific settings
• Made changes to improve compatibility with displays that aren't 1080p (wider than standard worked before, but not shorter)
• Fixed the popup that was supposed to show when clicking on population transfers
• Made pop transfers sprite bigger
• Incoming ships now sort themselves better
• Fixed MP not having random maps (forgot to add the new map preview to MP)
• Fixed issues with building queues not triggering properly in MP
• Made changes to turn processing order to have ships move before the AI has its turn
• Fixed more bugs with the save system
• TODO, add a custom music folder selection

Next update may also be similarly small due to getting a new temporary work contract for the next few months mixed with more time spent trying to make better art for the game (specifically planet landscape art). Once I am a bit further along with the art then I will have more focus on features again, but until then it is probably going to be more work on espionage and bug fixes.