Storage-related packages have been moved to PBot/Storage/.
MessageHistory_SQLite.pm has been moved to MessageHistory/Storage/SQLite.pm.
Quotegrabs' storage packages have been moved to Plugin/Quotegrabs/Storage/.
IRC handler-related packages have been moved to PBot/IRCHandlers/.
Commands registered by core PBot packages have been moved to PBot/Commands/.
Some non-core packages have been moved to PBot/Utils/.
Several packages have been cleaned up.
TODO: Move remaining core commands and IRC handlers.
TODO: Split AntiFlood.pm into Plugin/AntiAbuse/ files.
