Fixes
* Added missing separators to some resource frames
* Finally implemented the prefix preferences, they actually work now and
do not require a restart. It is flexible as well meaning that it generates
the options based on the installed instantiable resources, so adding new
resources does not require updating the preferences frame, it will be done
automagically.
* Fixed a race condition between messages, preferences, and resource kinds
which was necessary for the above.
* Made the physics options on the object frame layout more compact, the controls are properly layed out now.
* Increased the default room size a bit, default size is way too small.