Revert "remove ServerLog... configtags, use logsection instead"

This reverts commit 25ff05a56ff1e07bb1eaa0037c58909815433164.

Reason: #4171 isn't fixed yet so the server would SPAM you to death
without ServerLogDebugMessages because L_INFO is the minimum enabled
log-level
misc:
  more logging in ~CGameServer and ~Sound (suspected of deadlocks)
  WatchDog: style + move GDB detection logic to function under Platform/Misc
  re-add logging to ThreadPool (wasn't just there for my amusement, it's useful info)
  rename non-saying "Synchro.h" to RecursiveScopedLock.h