Version 0.5

# Version 0.5
#
#    - Added meta data on ButtonEventHandler for quick referencing on
the button
#    - Added state listeners on the button object (e.g hover, press,
release)
#    - Changed run method on ButtonEventHandler to execute event
listeners
#    - Added static class ExEventHandler (a storage place for our event
handler functions)
#        -> quit_button_hover_listener(),
quit_button_release_listener(), quit_button_press_listener()
#        -> reset_button_hover_listener(),
reset_button_release_listener(), reset_button_press_listener()
#    - Made the buttons scale and work with even listeners