BuildingEd: Thutzor's FurnitureTool click-drag to change orientation request.
BuildingEd: Added "wall trim" tiles.
BuildingEd: Category dock selection reflects the tiles of single-object selection.

Selecting a door object will select the door/frame tile.
Selecting a window object will select the window/curtains tile.
etc
BuildingEd: Building exterior wall trim is placed on 1st floor only.
BuildingEd: The current maps directory is now separate from TileZed's.

TileZed's should just show .tmx, where BuildingEd's shows only .tbx.
Currently, TileZed also displays .tbx.
Added PickTileTool.

Picks the topmost visible tile under the mouse pointer.
The tile is displayed in TilesetDock and TileDefDialog.
BuildingEd: Fixed issue with saving Wall object trim tiles.

This might not have caused any issues, since the "used tiles" category
should contain the trim tiles.
make-dist.tcl
Misc crud.
PickTileTool uses PointingHandCursor.
Fixed graphical corruption when resizing a building.
Ported PropertyEnum changes from WorldEd.
Added "highlight room under pointer" option.
Don't change the highlighted room when dragging to orient furniture.

When the user is left-click-dragging the mouse around to change the orientation
of a furniture object, prevent the currently-highlighted room from changing.
Fixed MapRenderer::pixelToTileCoordsInt() not handling negative coordinates properly.