Kepler 17311 Update

Since Kepler was promoted to default, I've updated the opt-in beta branch twice with a number of fixes and changes. Several dozen brave commanders have put enough time on these builds that I feel they're ready for the main branch.

Kepler 17311 Changes/Fixes:

• If a player fighter drone is too far from ship, will be instantly recalled, allowing player to use fast travel without waiting for fighters
  
• Text scaling in Options
  
• Option to change default map zoom behavior
  
• Map "highlight investigate" now also draws attention to any unscanned or unsurveyed planets (a somewhat common cause of players getting stuck is players failing to notice a planet that was detected but never scanned)
  
• Changes to gamepad controls
  
• Change to the behavior of the gravity gun
• If Lost Goryr is not found within a few minutes of spawning, location will be revealed by crew.
• Minor new anomalies, off-path content
  
• Minor mission fixes, adjustments
  
• Shields and battlestation charges persist across saves (but not Havok, yet)
  
• Reduced the crew repair effect for large crews
  
• UI tips in map view
  
• Fixed missing "The End" achievement
  
• Removed unused resource (Metallic He) from display lists
  
• Minor optimizations
  
• Fixed null reference error
  
• Various minor bugs, typo fixes
  

In addition to those changes, there's now a preliminary "difficulty" setting that doesn't have a UI yet.

To change difficulty, open up the developer console with F11. Then enter SetDifficult(x) where x is a positive or negative number. Negative numbers make the game easier than default, positive numbers make it harder. The scale is exponential, so start with small numbers (e.g., +/- 0.5 or 1.0).

Difficulty is application-wide, rather than per save.