Restructure

Moved all creation logic into factories;
Added items factory;
Added chests generation;
Minor tweaks

Added default setup for Collides property;
Renamed Generator's property;
Develop logic

Added factory for obstacles;
Added RegionBase prototype;
Fix ObstacleFactory
Develop logic

Changed probabilities extracting logic;
Develop logic

Adopted RegionBase;
Fix ItemFactory
Minor tweaks
Minor tweaks