api: rename RemoveKeyFromUser handler to removeKeyFromUser

Related to #289.
api: record user action in the ListTeams handler

Related to #397.
api: rename ListTeams handler to teamList

Related to #289.
api: record user action in the CreateTeam handler

Related to #397.
api: rename CreateTeam handler to createTeam

Related to #289.
api: record user action in the RemoveTeam handler

Only two handlers left...

Related to #397.
api: rename RemoveTeam handler to removeTeam

Related to #289.
api: record user action in the AddUserToTeam handler

Related to #397.
api: record user action in the RemoveUserFromTeam handler

Closes #397 (finally).