This hotfix addresses some of the initial bug reports for the first phase of Alpha.

- Fixed tiles becoming "unbuildable" when removing or pipetting ghost buildings
- Fixed buildings being placeable on top of the hub by dragging over it
- Fixed ghost buildings not being removed when a nearby energizer is destroyed
- Fixed enemy bases spawning at inconsistent rates throughout different preset difficulties
- Fixed drone hubs not being placeable when selected from the hotbar
- Fixed number of available drones sometimes displaying incorrectly