This update brings Minor Races systems into play, these are systems controlled by a minor race, which doesn't expand, some are space-faring, some are not, the player has the option to either vassalize or conquer them. Also, some races have associated quests that enable faster vassalization, and others provide specific bonuses once integrated into the empire. Interacting with them is done through the Diplomacy panel.
Changelog:
minor races (fixed number based on map size, in a later version I'll add more customization options for this)
buildings can be toggled off now (except the Admin Office)
conquest mechanic fixes
AI builds proper system defenses
added some feedback labels to explain some actions (such as build queue full)
slight turn performance optimization
For version 0.9.x I'm planning to add the final new features: fleet admirals (allowing fleets to gain experience) and finally enabling gate defense systems.