The right mouse button now selects a tile in the editor.
Laid the ground work for editing a tile's ID, class and flags.
To delete a tile, you click on it again.
Fixed the dependencies in the Makefile through GCC's -M option.
Some other minor fixes in the makefile.
Tiles on the map can now be marked as barriers and drawn as such.
You can now place multiple tiles in the editor through dragging the mouse.
Fixed the Debug build for the editor in the Makefile.
You can now actually set the metadata of the cells.
Metadata from the tileset is now transferred to the cells when you place tiles.
Fixed a bug with placing multiple tiles.