python

Added graphics as a property of Building objects, but need to test if it works.

Added another canvas for selecting which building to build.

Added visual representation of game objects in a small canvas. When clicking on a tile or building it gets shown there.

Added overlay to the headquarters building, and added it as an object in the finished_buildings list. Moved said list to BuildingManager as it makes more sense there than in QueueManager. Also select window size according to monitor resolution (two options), and added scrolling in the canvas by right-clicking and dragging. And a couple other small fixes.