DB/Creature: Remove startup error

Closes #12980
Scripts/Commands: Add optional reason to server shutdown/restart commands

Display a "reason" ingame in the server shutdown ingame messages
Fix multiple typos in the .server idlerestart/idleshutdown/restart/shutdown commands

Closes #2671
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4