Show spaces horizontal bar
### Summary This merge request adds a horizontal bar at top of room list, which shows spaces. By clicking on a space, user can filter out rooms belonging only to that specific space. ### Pending/ Help needed #### Segfault when loading active connection on startup Refer `void SortFilterRoomListModel::cacheSpaceHierarchy()` ([link](https://invent.kde.org/flyingcakes/neochat/-/commit/8c372800d727c1e9d1694686a24677d0a6cdfddf#b969e462c30df43ef3714ea441948d8d8027f6a0_117_126)) in `src/sortfilterroomlistmodel.cpp`. On [line 129](https://invent.kde.org/flyingcakes/neochat/-/commit/8c372800d727c1e9d1694686a24677d0a6cdfddf#b969e462c30df43ef3714ea441948d8d8027f6a0_117_129), I have called `connection->allRooms()`, which segfaults if the active connection hasn't been loaded yet. Is there a way to ensure that `Controller::instance().activeConnection()` on line 128 waits till connection is loaded? #### Avatars Avatars on space horizontal bar aren't aligned to vertical middle. I'll need help with that. Using the code below doesn't help with padding ```qml delegate: QQC2.Control { topPadding: 10 contentItem: Kirigami.Avatar { ..... } } ``` This complains about uninitialized properties in `Kirigami.Avatar`. (`id`, `currentRoom`, `avatar`, `index` are properties utilized during run time) After we get around these two issue, this MR will be ready from my side.
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