Revert "Remove functionality not required for LogIt Web"

This reverts commit 8dc3ade9fa782b6f38964934fc385578e10104ef.
Remove pointless method call
Synchronize AccountManager methods, and add buffer-lock
Add QueuedMap.element() method
A few improvements to LogItPlugin
Remove unnecessary stuff (this time properly)
Add CredentialManager, GameData and Lua script support
Implement credential-based registration detection
Remove "/account datum" and "/account status" commands