KeyIndicator:

- separated in it's own class.
- subclass of Field.
- has an ArrayList of integers representing the 
  state of a key, if pressed = 1, if not pressed = 0.
- Overrides the drawSide method to only draw a side when
  corresponding key is pressed.
  

Field: 
- setBounds -> sitSize for double values
- setSides is now done automatically in the setSize method.

and other minor changes..