Stable build

Improved Default.xml level and removed the Warzone.xml.
Levels now contain three layers: Background > Platforms > Foreground.
Edited and improved server commands.
Edited PIPES - transmission is no longer static.
Vastly improved level loading on server and client side.
Fixed collision detection so that it no longer hard codes values (was
for testing purposes).
Levels in the editor can now optionally define spawn locations which
will be randomly assigned to connecting players.
Fixed most compilitation warnings.
Added level readme.txt which explains the use of GLEED2D briefly for use
with the game.
Known bug: 3+ player overriding.
Known bug: map not loading due to packet drop.