Generic Search Page

Pull the generic aspects from Room search and join room pages into it's own component. This is done in anticipation of using the new generic search page for a user search functionality.

- `SearchPage` is now used for the generic version with the old one being renamed `RoomSearchPage`
- `JoinRoomPage` is renamed to `ExploreRoomsPage` inline with everywhere else in NeoChat

There is also some cleanup of the code for both search pages in here.

src/models/searchmodel.cpp

@@ -36,7 +36,7 @@ void SearchModel::setSearchText(const QString &searchText)
 
 void SearchModel::search()
 {
-    Q_ASSERT(m_connection);
+    Q_ASSERT(m_room);
     setSearching(true);
     if (m_job) {
         m_job->abandon();
@@ -62,7 +62,7 @@ void SearchModel::search()
 
     };
 
-    auto job = m_connection->callApi<SearchJob>(SearchJob::Categories{criteria});
+    auto job = m_room->connection()->callApi<SearchJob>(SearchJob::Categories{criteria});
     m_job = job;
     connect(job, &BaseJob::finished, this, [this, job] {
         beginResetModel();
@@ -74,17 +74,6 @@ void SearchModel::search()
     });
 }
 
-Connection *SearchModel::connection() const
-{
-    return m_connection;
-}
-
-void SearchModel::setConnection(Connection *connection)
-{
-    m_connection = connection;
-    Q_EMIT connectionChanged();
-}
-
 QVariant SearchModel::data(const QModelIndex &index, int role) const
 {
     auto row = index.row();