Added history handling for set contents

Allow undo of set color

Allow the user to alter the tool bar icon size

Split some stuff out of the edit tool bar into move and object tool bars. The object tool bar is now located on the left side of the screen as the top one is running out of space.

Added icons for undo and redo

Added undo/redo foundations. Capable of undoing and redoing delete operations

Added move up/down actions.

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mercurial