Add the "Online Accounts" button to the hamburger menu

Adrien Plazasrequested to merge
(removed):wip/aplazas/app-menu-redesign into master

Add the "Online Accounts" button to the hamburger menu and drop the "Online Accounts Settings" button from the accounts list. This goes on top of !33 (merged).

This is obviously not targetting 3.30. :)

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