Merge in CGD/gather-and-defend from prog/fix_detection_range to main
* commit '4568c350bfec91842dc9a8fe0917798fbfce7dda':
toggle collider in coroutine instead of script
fix detection range
- added art for house and UI
- put population in ResourceManager
- create house prefab
- added code for adding and removing pop depending on entity
- refactor harvesters so they inherit from ally
- modify placeholders and buttons so that only units cost population
- add events for population and resources changing
- add population relative configs to global config
- add start resources values to Levels
- add debug feature for generating resources for free