rename header files from *.h to *.hpp

src/widgets/notebookbutton.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "fancybutton.hpp"
+
+#include <QWidget>
+
+namespace chatterino {
+namespace widgets {
+
+class NotebookButton : public FancyButton
+{
+    Q_OBJECT
+
+public:
+    static const int IconPlus = 0;
+    static const int IconUser = 1;
+    static const int IconSettings = 2;
+
+    int icon = 0;
+
+    NotebookButton(QWidget *parent);
+
+protected:
+    void paintEvent(QPaintEvent *) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+signals:
+    void clicked();
+
+private:
+    bool _mouseOver = false;
+    bool _mouseDown = false;
+    QPoint _mousePos;
+};
+
+}  // namespace widgets
+}  // namespace chatterino