ECS rework and UI fix

Version 1.2.0 is released today at 15.07.25

It contains:

1. Rework of the ECS with correct Entity Factory implementations
2. UI tolerance fix that caused overlapping hitboxes
3. General code quality improvements
4. Clean up

Comment:
Today i reworked the ECS, i made bad components which led to me giving in to my laziness while making the first version. I had cramped components and weird initialization of Entities in main. Also World and System implementations got quite an improvement. I generalized the code and made some way for new content. 

I also since the beginning of development had this UI bug where row options would overlap underlying visuals. Turns out i was stupid enough to not set my UI tolerances in the new components and only had a vague default that had sprung into action which was around 35px which explains this overlap perfectly.