R1:6080d7411294

Created personal vs. global herald rule distingtion

Summary:
A personal rule only has actions targeting the owner. Likewise, only they can
edit the rule. OTOH, a global may affect any target and is editable by anyone.

There are no new action types. Instead, type of the rule modifies the available
targets and the messaging in the ui. This is beneficial because herald rule
adapters don't need to be aware of the difference between emailing the owner of
a personal rule and emailing an arbitrary user.