Enhancement: Spaces list in admin settings

The admin settings now have a view to list all spaces for the current instance. This makes it possible for space admins to manage all spaces in one place.

https://github.com/owncloud/web/pull/8178
https://github.com/owncloud/web/pull/8195
https://github.com/owncloud/web/pull/8190
https://github.com/owncloud/web/pull/8192
https://github.com/owncloud/web/pull/8199
https://github.com/owncloud/web/pull/8224
https://github.com/owncloud/web/pull/8228
https://github.com/owncloud/web/pull/8229
https://github.com/owncloud/web/pull/8231
https://github.com/owncloud/web/pull/8236
https://github.com/owncloud/web/pull/8238
https://github.com/owncloud/web/pull/8234
https://github.com/owncloud/web/pull/8249
https://github.com/owncloud/web/pull/8230
https://github.com/owncloud/web/pull/8262
https://github.com/owncloud/web/pull/8247
https://github.com/owncloud/web/pull/8273
https://github.com/owncloud/web/pull/8268
https://github.com/owncloud/web/pull/8233
https://github.com/owncloud/web/pull/8333
https://github.com/owncloud/web/pull/8334
https://github.com/owncloud/web/pull/8477
https://github.com/owncloud/web/issues/8219
https://github.com/owncloud/web/issues/8267
