[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/services/gui/view_port_i.h

@@ -0,0 +1,51 @@
+/**
+ * @file view_port_i.h
+ * GUI: internal ViewPort API
+ */
+
+#pragma once
+
+#include "gui_i.h"
+#include "view_port.h"
+
+struct ViewPort {
+    Gui* gui;
+    bool is_enabled;
+    ViewPortOrientation orientation;
+
+    uint8_t width;
+    uint8_t height;
+
+    ViewPortDrawCallback draw_callback;
+    void* draw_callback_context;
+
+    ViewPortInputCallback input_callback;
+    void* input_callback_context;
+};
+
+/** Set GUI reference.
+ *
+ * To be used by GUI, called upon view_port tree insert
+ *
+ * @param      view_port  ViewPort instance
+ * @param      gui        gui instance pointer
+ */
+void view_port_gui_set(ViewPort* view_port, Gui* gui);
+
+/** Process draw call. Calls draw callback.
+ *
+ * To be used by GUI, called on tree redraw.
+ *
+ * @param      view_port  ViewPort instance
+ * @param      canvas     canvas to draw at
+ */
+void view_port_draw(ViewPort* view_port, Canvas* canvas);
+
+/** Process input. Calls input callback.
+ *
+ * To be used by GUI, called on input dispatch.
+ *
+ * @param      view_port  ViewPort instance
+ * @param      event      pointer to input event
+ */
+void view_port_input(ViewPort* view_port, InputEvent* event);