Update notes for August 20

Greetings Captains, This time around we made some under-the-hood upgrades along with a number of fixes and improvements. Here's the full list of improvements: * Game engine upgrades, OpenXR support * Added Pause button to left hand menu for convenience * Added Quit button to hand menu for skirmish mode and tutorial * Fixed bug with NPC fighters * "Space Cloud" shader updates - improves lighting effects * Fleet graphics updates: Kraya, Boix, Dionoid, Vistian * Fixed enemy AI issue where they wouldn't attack ships you need to protect * Improved mothership AI * Increased Proxima Station hull / armor * Decreased Mothership side armor * Slight damage reduction for Kraya Proton Torpedo (12 damage per shot to 10) * Flak cannon: Only proximity explode on enemies * Added new friendly fire checks, changed fighter default formation * Other fixes and improvements