Update for KSP 1.5.x

[mwerle]

• [x] Recompile using KSP1.5
• [x] Test functionality (TODO: Make a test checklist)
  • [x] Kemini
  • [x] KEES
  • [x] OMS / KLS
• [x] Check outstanding bugs
• [x] Update version numbers
• [x] Update changelog
• [x] Make release packages
• [x] Release on:
  • [x] GitHub
  • [x] SpaceDock
  • [x] Curse
• [x] Update Forum posts
  • [x] Release
  • [x] Dev