rename header files from *.h to *.hpp

src/widgets/mainwindow.hpp

@@ -0,0 +1,43 @@
+#pragma once
+
+#include "widgets/notebook.hpp"
+#include "widgets/titlebar.hpp"
+
+#ifdef USEWINSDK
+#include <platform/borderless/qwinwidget.h>
+#endif
+
+#include <QMainWindow>
+#include <boost/property_tree/ptree.hpp>
+
+namespace chatterino {
+namespace widgets {
+
+class MainWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+    void layoutVisibleChatWidgets(Channel *channel = nullptr);
+    void repaintVisibleChatWidgets(Channel *channel = nullptr);
+    void repaintGifEmotes();
+
+    void load(const boost::property_tree::ptree &tree);
+    boost::property_tree::ptree save();
+    void loadDefaults();
+
+    bool isLoaded() const;
+
+    Notebook &getNotebook();
+
+private:
+    Notebook _notebook;
+    bool _loaded;
+    TitleBar _titleBar;
+};
+
+}  // namespace widgets
+}  // namespace chatterino