Support relative endpoints in url_for_plugin
Support locator property in addition to getLocator

Getters are ugly, properties are beautiful!
Handle sqlalchemy .one() failing nicely
Fix plugin static rule with url prefix
Add attrs_changed SA utility
Add strip_whitespace helper

Useful e.g. for wtforms filters
Let plugins extend the event cloning process
Add event_deleted signal
Use proper MIME type for json error response
better css for plugin settings form
Disable the old InstantMessaging plugin
Add get_plugin_template_module function
Remove "new" from new plugins (urls/menu)

Instead add "old" to the old ones
Avoid template names collisions

Use subfolder for blueprint templates
Add material_downloaded signal