Customizable user menu

[kulmann]

Description

This PR makes navigation items customizable with regard to which menu they appear in. By default, anything appears in the app switcher. You can define a menu: "user" in applications in config.json or in the exported navItems of applications. With a separate PR for ocis, the settings and accounts UI will appear in the user menu by default.
Also:

• We took the chance to add icons to menu items and rename the Manager your account menu item to Profile - which is a better fit, because it just shows read only information.
• We replaced the Logout button on the profile page with an Edit button which links to the oc10 personal settings if those are available and to the settings UI if that is available.

In case you want to add a nav item to the user menu manually, you can do so via the config.json file:

"applications": [
          {
                "title": {"en": "Settings"},
                "icon": "application",
                "url": "http://host.docker.internal/px1/index.php/settings/personal",
                "target": "_self",
                "menu": "user"
          }
]

Motivation and Context

Improve navigation UX and bridge setup.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[LukasHirt]

LGTM 👍