Mention that signal receivers should accept kwargs
Add support for template hooks
Add event header template hook
Set the priority in a much cleaner way
Fix query logging

- Handle plugin paths correctly
- Include MaKaC code in stacktrace
- Include mako templates in stacktrace
Don't query DB in RoomMapper if roomName is empty
Support proper default values for settings

Can be set in the SettingsProxy and will be used in .get() and
.get_all() unless another default value is specified
Use new setting defaults in RB
Add list_from_signal util
Allow WP class args in JinjaMixin
Add WPJinjaMixinPlugin