Transform Clipboard to singleton and add rich text copying feature

src/clipboard.h

@@ -0,0 +1,37 @@
+/**
+ * SPDX-FileCopyrightText: Black Hat <bhat@encom.eu.org>
+ *
+ * SPDX-LicenseIdentifier: GPL-3.0-only
+ */
+#pragma once
+
+#include <QObject>
+
+class QClipboard;
+class QImage;
+
+/**
+ * Clipboard proxy
+ */
+class Clipboard : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(bool hasImage READ hasImage NOTIFY imageChanged)
+    Q_PROPERTY(QImage image READ image NOTIFY imageChanged)
+
+public:
+    explicit Clipboard(QObject *parent = nullptr);
+
+    bool hasImage() const;
+    QImage image() const;
+
+    Q_INVOKABLE bool saveImage(const QUrl &localPath);
+
+    Q_INVOKABLE void saveText(QString message);
+
+private:
+    QClipboard *m_clipboard;
+
+Q_SIGNALS:
+    void imageChanged();
+};