Core: Fixed some compile warnings
Core: Clean up whitespace, and remove a silly warning in boss_lurker_below.cpp
Core: More clean up whitespace
Core/Accounts: sessionkey field in account table is only a temporary storage to pass data from authserver to worldserver and should only be used as such. Clearing sessionkey from database after a successful login to prevent possible exploits.
Core/Auth: Reverted part of fb43a92cc2aaffab42efebf025b6a12c01af8fde - session key is still needed after logging in to be able to switch realms
Core/AI: Fixed merge error