Display IndexingView when adding an account

[x] Move indexingView from server to client side,
[x] FIX activity server error messages that impacted on fetching data,
[x] remove dead code on views,
[x] clean synthax,
[x] FIX realtime issues about mailbox or account updates that didnt update applicationView,
[x] compare accountID that is indexing, not to dispatch indexingView for all accounts.
User scenari
[x] indexingView must be dispatched when user is adding an account,
[x] indexingView should be dispatched when application first render,
[x] indexingView should be dispatched after several browser refresh,
[x] applicationView must be updated into all browser tabs (realtime).
Global improvements
[x] moving props declaration from applicationComponent to getters,
[x] counter were missing on special mailboxes,
[x] socket events werent dispatched anymore.

cozy / cozy-emails