* FastMutex is now used to synchronize dbghelp calls, and StackWalk64 calls are now synchronized.
* moved RundownProtection and SpinLock to ProcessHacker.Common.Threading
* some cleanup
git-svn-id: svn://svn.code.sf.net/p/processhacker/code@1422 21ef857c-d57f-4fe0-8362-d861dc6d29cd