Add new turn manager that should be more correct and potentially more
efficient.
Remove evil CNetServer/CNetClient multiple inheritance of CTurnManager.
Add multiplayer autostart.
Various minor cleanups.
This was SVN commit r7551.
Giant merge from
http://svn.wildfiregames.com/hg-source/file/5fb522019d5e
Infrastructure is largely complete, gameplay is largely missing
Disabled by default; use command-line flag "-sim2"
(Second attempt at commit...)
This was SVN commit r7259.
