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.
Fix sys_get_executable_name.
Add mock object support.
Add CxxTest wrapper to support "-test TestSuitename" and "-test
TestSuitename::test_case_name" command-line arguments for running
individual tests.
This was SVN commit r7081.
