Moderation Alerts Pack 2.0

This is the first major update for Moderation Alerts Pack. Although it doesn't feature too many new things, it's code has been totally rewritten, thus a new major release was necessary. It features:

• A completely rewritten approach to installation, uninstallation, core edits and hooks injection;
• Core edits are now checked upon installation and if one of the file the plugin wants to patch doesn't have the minimum required write permissions (664), the installation will be aborted and a message containing all the files that need to be updated will be prompted to the user;
• Uninstallation now works even if MyAlerts has been previously uninstalled and its database tables are not available. No more SQL errors!
• 3 new alert types has been added: you can be now notified whenever an user edits your signature (both from MCP and ACP), whenever an user approves your threads and whenever an user unapproves your threads;
• Dramatic code and file size cleanup: taking 3KB less than the previous version, but with a lot of new additions;