As a user I want the ability to define lists that can work across different clients.
With these lists I want the ability to do any of the following...
- view only events from pubkeys in the list
- exclude events from pubkeys in the list
I want to be able to add a pubkey to multiple lists (e.g. a list of Developers, and a list of Saxophone players)
I may also have value in sharing a list or using another person's list
