Fileman default open and Screenshot viewer (#1102)

* WIP expensive way

* Add default file handling to fileman

* Remove screenshot_reader and tests

* Read data in chunks

* Format

* Fix error text position

* PR feedback

---------

Co-authored-by: kallanreed <kallanreed@outlook.com>

firmware/application/apps/ui_ss_viewer.hpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2023 Kyle Reed
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UI_SS_VIEWER_H__
+#define __UI_SS_VIEWER_H__
+
+#include "ui.hpp"
+#include "ui_navigation.hpp"
+#include "ui_painter.hpp"
+#include "ui_widget.hpp"
+#include "file.hpp"
+
+namespace ui {
+
+class ScreenshotViewer : public View {
+   public:
+    ScreenshotViewer(NavigationView& nav, const std::filesystem::path& path);
+    bool on_key(KeyEvent key) override;
+    void paint(Painter& painter) override;
+
+   private:
+    NavigationView& nav_;
+    std::filesystem::path path_{};
+};
+
+}  // namespace ui
+
+#endif  // __UI_SS_VIEWER_H__