Revert "Swing51 Tree Node Icons complete"

This reverts commit 47deee870714721e92f5d68f25d03be2dee83ff8.

Conflicts:
	Swing15 Combo Boxes/src/gui/MessagePanel.java
	Swing15 Combo Boxes/src/gui/Toolbar.java
	Swing15 Combo Boxes/src/gui/Utils.java