Merged admin account view and controller into main page
Updated account admin UI to better represent current and future plan/schedule
We can't just allow changing payment engines, even for admins
Merged all admin views into pages themselves
Removing manual selection of payment engine for user - it will only be done through plans management page
Added isUserInteractionRequired() method to payment engines
Refactored Plan class replacing magic getter with real one, updated all code that uses them.