ADDONS:
 - Added: onLoadTemplate events
 - Removed: PasswordChanger install part (Roundcube). This plugin will be part of the RoundcubePlugins plugin

ENGINE
 - Added: Missing onLoadTemplate events

PLUGINS:
 - Added: iMSCP_Plugin::migrateDb() method which allow to migrate plugin database schema
 - Fixed: Plugin info not updated when the plugin is deactivated which prevent update to be triggered when needed
 - Readded: Automatic triggering of the updatePluginList action after plugin upload
 - Updated: Plugin API to version 0.2.7 (changes are backward compatible)