reorganized Pooling API
improved pooling architecture
added SlotConfiguration logic and changed responsibility of PlacingSlots
improved architecture of placing
updated unity scene
implemented simple placing of trees
put logic of finding indexes in separate class
added IndexFinder.cs.meta
added different start slot for trees depending on the player's side
added second player and added pools outside of players
added building placer
added proper replacing of elements
improved logic of BuildingPlacer
improved Action architecture
implemented cooldown and view
organized files
implemented common GUIRendering