combine root subscriptions into maps

[flexsurfer]

combine root subscriptions into maps we have too many root subscriptions, its better to combine them in the maps by groups

for example

(reg-root-key-sub :mailserver/current-id :mailserver/current-id)
(reg-root-key-sub :mailserver/mailservers :mailserver/mailservers)
(reg-root-key-sub :mailserver.edit/mailserver :mailserver.edit/mailserver)
(reg-root-key-sub :mailserver/state :mailserver/state)
(reg-root-key-sub :mailserver/pending-requests :mailserver/pending-requests)
(reg-root-key-sub :mailserver/request-error? :mailserver/request-error)
(reg-root-key-sub :mailserver/fetching-gaps-in-progress :mailserver/fetching-gaps-in-progress)

should be

(reg-root-key-sub :mailserver :mailserver)

where :mailserver is a map with all keys

{:current-id
 :mailservers  
 : state} 

etc