Internal showcase build

Improved: Warlords.xml map now has lethal bounds to prevent players
endlessly falling. The platforms have been moved into the correct bg and
fg layers.
Fixed: Players can no longer damage themselves with their own bullets.
Note: cleaned then compilied both in debug and release modes for
server/client.
Added: Window icon for client.
Modified: Player jump arcs are now (stupidly) high to suit the warlords
map (only for the showcase).