HaikuDepot: Lists; Categories + Stabilities

Remove use of custom list class where it is not
really required in the area of Categories. Also
introduces stabilities relayed over from the
Server and used in the HD user interface instead
of being hard-coded.

Relates To #15534

Change-Id: Ib71141e71cd4a0b4882827e2e59b62072de01b4b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3331
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

HaikuDepot: Categories from Server

The list of categories for packages is currently
hard-coded into the HaikuDepot desktop
application. This change will change that so that
the list is obtained from the HaikuDepot Server
system and is always up to date with the server's
list of categories.

Change-Id: I757732f4d771e1599d6ad9c85cd65905640de928
Reviewed-on: https://review.haiku-os.org/c/1478
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

HaikuDepot: Replace the "featured packages" checkbox with tabs.

As discussed in #14598, there are now two tabs instead of the
checkbox: "Featured packages" and "All packages". It otherwise
behaves as before.

Also fixes #12428.

Changes to HaikuDepot GUI

As discussed at #13860.

* Moved "Show only featured packages" from the "Show" menu to a
checkbox in the filter view.
* Moved "Repositories" popup menu into the menu bar.
* Removed the "Featured packages" title.
* Entering a search term doesn't override the "Only featured"
filter anymore (used to disable the "Only featured" filter).

HaikuDepot: Resurrect Options menu...

And move the (new) checkmarks into the Options menu. This makes them less
easy to discover, but cleans up the UI, especially since the options to show
development and source code packages are not very important for most users.

HaikuDepot: Centralized user account features in the UI

There is now a right-aligned second menu bar for the account management.
The menu label is what was previously shown underneath the search terms field.
The menu items have moved from the Tools menu into the new user menu. This
means the login/logout functionality is directly available where the login
info is shown in the UI when you click it.

HaikuDepot: Restore logged in user across sessions.

* Store the username in the app settings. The password was already stored
in the keyring. Restore the username upon next launch.
* Display the logged in user in the main window.
* Added "Log out" menu entry.
* When the password could not be retrieved from the keyring (also because
the user rejects the keyring dialog), unset the username.
* Allow unsetting the username by passing an empty name.

HaikuDepot: Organized source into sub-folders

HaikuDepot: Resurrect Options menu...

And move the (new) checkmarks into the Options menu. This makes them less
easy to discover, but cleans up the UI, especially since the options to show
development and source code packages are not very important for most users.

HaikuDepot: Centralized user account features in the UI

There is now a right-aligned second menu bar for the account management.
The menu label is what was previously shown underneath the search terms field.
The menu items have moved from the Tools menu into the new user menu. This
means the login/logout functionality is directly available where the login
info is shown in the UI when you click it.

HaikuDepot: Restore logged in user across sessions.

* Store the username in the app settings. The password was already stored
in the keyring. Restore the username upon next launch.
* Display the logged in user in the main window.
* Added "Log out" menu entry.
* When the password could not be retrieved from the keyring (also because
the user rejects the keyring dialog), unset the username.
* Allow unsetting the username by passing an empty name.

HaikuDepot: Organized source into sub-folders