implement mouse handler
Merge branch 'master' of https://github.com/r4ccoon/DIS2assignment3

Conflicts:
	Main.java
fixing the indenttin
Merge branch 'master' of https://github.com/r4ccoon/DIS2assignment3

Conflicts:
	CloseButton.java
	Main.java
	WindowManager.java
ignore extra merging files
fix collision detection, move super handlepaint call to the bototm