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

sorting && init categoriy for rooms.

src/imageprovider.h

@@ -0,0 +1,27 @@
+#ifndef IMAGEPROVIDER_H
+#define IMAGEPROVIDER_H
+
+#include <QObject>
+#include <QtCore/QReadWriteLock>
+#include <QtQuick/QQuickImageProvider>
+
+#include "connection.h"
+#include "imageproviderconnection.h"
+
+class ImageProvider : public QQuickImageProvider {
+ public:
+  explicit ImageProvider(QObject* parent = nullptr);
+
+  QImage requestImage(const QString& id, QSize* pSize,
+                      const QSize& requestedSize) override;
+
+  void initializeEngine(QQmlEngine* engine, const char* uri);
+
+  ImageProviderConnection* getConnection() { return m_connection; }
+
+ private:
+  QReadWriteLock m_lock;
+  ImageProviderConnection* m_connection;
+};
+
+#endif  // IMAGEPROVIDER_H