Fix for DBCore crash
Fix from Zaela_S to stop mobs aggroing on dead players when using RespawnFromHover.
Removed _log message from zone/CatchSignal on Linux as it can deadlock on shutdown if another signal is received while the _log call is being processed.
Added some consts to remove 'deprecated string to char*' warnings.
Merge pull request #29 from addtheice/master

consts on char*'s to remove the deprecation of const string to char* warning
Added some error logging into ZoneDatabase::NPCSpawnDB for #npcspawn create