End-user message

[PerseusRealDeal]

I'd like to master also and messages dedicated for end-user communications kinda notifications.

Prerequisites:

1. Such messages for end-users should be transfered even if log.turned == .off

2. Also and end-user messages should trigger custom action on log.output == .custom

3. End-user message should have predetermined level (.notice is recommended, so that message filter should work for still)