Removed the libgdx image which was originally included in the assets
folder.

Signed-off-by: Michael Opitz <michael.w.opitz@gmail.com>
Removed the Dawnlike tileset. I'm going to use my own tiles/graphis for
this project.
Removed the BMFont configuration file.

Signed-off-by: Michael Opitz <michael.w.opitz@gmail.com>
Reorganized the assets folder structure. The 'data' folder should be the
top level folder below assets.

Signed-off-by: Michael Opitz <michael.w.opitz@gmail.com>