Major updates to most network classes.
Simplify CNetServer so it doesn't duplicate any client behaviour; all
players now run CNetClient.
Remove most player/slot management from networking code.
Wait for all players to finish loading before starting the simulation.
Remove CGameAttributes; attributes are now just a JS object.
Remove CPlayer; they are now just simulation entities.
Handle player colours via simulation system.
Add a default map for Atlas, so it always has something to load.
Move network documentation to Doxygen.
Remove lots of now-unused code.
This was SVN commit r7653.
Merge from 22b478ffed8d.
Pure scripted interface definitions.
Entity creation from scripts.
Improved messaging system.
Messages on entity deletion.
Basic player entities.
Player ownership.
Bug fixes.
This was SVN commit r7281.
