Update default.php
Merge pull request #4125 from zero-24/patch-3

[#34077] Problem if feed contains only a few entries
Added events map property.

This allows for events to be mapped to plugin groups independently.
Synced with latest JModelAdmin changes.
Trigger extension save events on config save actions.
Trigger content save and delete events.
Consistency fix.

onContentPrepareData is a content event. Kept user group loading for BC.
Load user plugins.