Release: Sentimental Chairs

	- refactoring, removed the .update_display_properties from
image_element, since the .update_properties method proved
	  sufficient, with some minor addition

	- introduced scale_x and scale_y in Image_element
	
	- introduced a random_frame property in Animation_pixmap
	
		- if said property is true, Animation_pixmap will then randomize
(uniquely) between the frames
		
	- introduced a random frame bias system, where you can select a frame,
and choose a bias amount, and the
	  likelihood of this frame being up will be the bias amount in percent
(0 being no bias, 100 being full)
	
	- introduced some new default scene creation footage
	
	- set up a more robust and properly working event_listener/remover
system in Controller, with two methods
	  handling them
	  
	- fixed a row selection bug, where it would crash if too many nodes
were expanded (which would result in
	  row numbers greater than the existing amount of rows)
	  
	- fixed a bug in the Properties_list.update_rows_data () method, which
would cause a nullpointer crash,
	  due to it referencing row numbers greater than what exist, if enough
nodes were expanded, and then
	  some values altered

	- fixed a row selection bug, where selecting an animationpixmap row
would result in a crash