Add organizer dropdown menu on top right

[mariobehling]

Add organizer dropdown menu on top right in tickets component similar to the previous eventyay version.

Also rename "User Settings" to "Account".

Dropdown menu items should be as follows:

Dashboard links to /tickets/control/
My Events links to /tickets/control/events/
Organizers links to /tickets/control/organizers/

Account links to /tickets/control/settings/
Admin links to tickets/control/admin/ (only for admins)

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