Version 0.20.3

Hey everyone, a very minor update containing a feature that was requested over in the Discord, and a pair of bugfixes, one of which I ran into while creating the Brand New Tutorial (also requested by discord users).

New features:

• You can now set 'zoom', 'x_zoom' and 'y_zoom' as map properties, and the camera will automatically zoom in to that level when the player enters that room. If you leave the room for another room without the property, note that the present zoom level will be maintained.

Bug Fixes:

• When using a parallel process to reduce the volume to a default of 0, it will actually go to 0.
• When the go_to_map function is called from a menu screen, the map is no longer frozen when entering the map.