The camera now updates a shader with the positions, strengths and colors
of nodes in the light group.
The sources cast light around them on the z layer they are on.
They do not work for Tilemaps yet and
can't be occluded.
The light of different sources does not
get stronger if they overlap.
Main change is the fixed main menu
The other changes include newly added resources, like
the new ground tile and blobby animations/designs
I also experimented with the display size and camera
To adapt to the new Blobby design, the default tile size was changed
to 24x24
