It was trying to do too many things. Also, the adjust tool is now free
to operate on actors, and can toggle the form of a number of them.
- Rearranged the palette to put colored tiles in canonical key order,
finally
- Expanded the size of the SVG overlay slightly so hover effects don't
get cut off at the level border
- Fixed some MouseOperation nonsense by simply using the same object
when the same operation is bound to both mouse buttons
- Added a verb and preview to the adjust tool, in the hopes of making it
slightly more clear what it might do
- Enhanced the adjust tool to place individual thin walls and frame
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