revert: group action into a single dictionary
We had 4 different variables to hold the list of the 4 possibles
actions. I'm grouping them in a single dictionary for a few reasons.
First, it makes it clearer they are all related and meant to be the
final actions performed by revert. Second this simplifies the parameter
of the _performrevert function. Finally the two elements in each entry
(list and message) have a different consumers in different functions,
this change will make it easier to split them in a later commit.
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