Alter code structure && change room list filtering mechanics && add

sorting && init categoriy for rooms.

src/imageproviderconnection.h

@@ -0,0 +1,30 @@
+#ifndef IMAGEPROVIDERCONNECTION_H
+#define IMAGEPROVIDERCONNECTION_H
+
+#include <QObject>
+
+#include "connection.h"
+
+class ImageProviderConnection : public QObject {
+  Q_OBJECT
+
+  Q_PROPERTY(QMatrixClient::Connection* connection READ getConnection WRITE
+                 setConnection NOTIFY connectionChanged)
+
+ public:
+  explicit ImageProviderConnection(QObject* parent = nullptr);
+  ~ImageProviderConnection();
+
+  QMatrixClient::Connection* getConnection() { return m_connection; }
+  void setConnection(QMatrixClient::Connection* connection) {
+    emit connectionChanged();
+    m_connection = connection;
+  }
+
+ private:
+  QMatrixClient::Connection* m_connection;
+ signals:
+  void connectionChanged();
+};
+
+#endif  // IMAGEPROVIDERCONNECTION_H