Revisit Approver concept

[jbair06]

Revisit the need and use of the approver system. This applies to transactions, as well as potentially the use of nicknames on an organizational level.

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1. Add tests for organization approvers #644
   QA +1
   
2. Approver groups should be a predefined list, approved by the organization #652
   Backlog Question +2
3. Users should be able to easily identify if a transaction lacks the necessary approvals in the transaction status view #653
   Question +1
4. Add the ability to import nicknames for entities that have been approved by the organization members #654
   Backlog Question +2
5. Transaction signing and Transaction Tool software updates tasks should not be shown to users unless the approver group has approved the task #684
   Question +1
6. Add the option to hide transactions from signers if the approver has not approved yet #1044
   +0