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.
move dbghelp and powrprof-specific stuff into external_libraries
dbghelp: dynamically import functions to avoid needing the .lib
This was SVN commit r6912.