Be explicit about MixFile stream positions.
Revert "Players and bots surrender on disconnect."

This reverts commit 500c24fbaf942159c0adb7a37d1828f34a4c6267.
Remove duplicate gnrl sequences definition
Infiltration code cleanup
Implement thief
Increase spy and thf healths to 80
Make thief uncrushable
Cancel activity when hijacked to stop old unit activities