Each GUI Page gets its own compartment and all ScriptInterfaces in the
same thread should now use the same JS Runtime.
This is required for the SpiderMonkey upgrade.
Check the ticket for details.
Closes#2241
Refs #1886
Refs #1966
This was SVN commit r14496.
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.