[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/modules/widget_elements/widget_element_i.h

@@ -0,0 +1,91 @@
+/**
+ * @file widget_element_i.h
+ * GUI: internal Widget Element API
+ */
+
+#pragma once
+#include <furi.h>
+#include <gui/view.h>
+#include <input/input.h>
+#include "widget_element.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct WidgetElement WidgetElement;
+typedef struct Widget Widget;
+
+struct WidgetElement {
+    // generic draw and input callbacks
+    void (*draw)(Canvas* canvas, WidgetElement* element);
+    bool (*input)(InputEvent* event, WidgetElement* element);
+
+    // free callback
+    void (*free)(WidgetElement* element);
+
+    // generic model holder
+    void* model;
+    FuriMutex* model_mutex;
+
+    // pointer to widget that hold our element
+    Widget* parent;
+};
+
+/** Create multi string element */
+WidgetElement* widget_element_string_multiline_create(
+    uint8_t x,
+    uint8_t y,
+    Align horizontal,
+    Align vertical,
+    Font font,
+    const char* text);
+
+/** Create string element */
+WidgetElement* widget_element_string_create(
+    uint8_t x,
+    uint8_t y,
+    Align horizontal,
+    Align vertical,
+    Font font,
+    const char* text);
+
+/** Create text box element */
+WidgetElement* widget_element_text_box_create(
+    uint8_t x,
+    uint8_t y,
+    uint8_t width,
+    uint8_t height,
+    Align horizontal,
+    Align vertical,
+    const char* text,
+    bool strip_to_dots);
+
+/** Create button element */
+WidgetElement* widget_element_button_create(
+    GuiButtonType button_type,
+    const char* text,
+    ButtonCallback callback,
+    void* context);
+
+/** Create icon element */
+WidgetElement* widget_element_icon_create(uint8_t x, uint8_t y, const Icon* icon);
+
+/** Create frame element */
+WidgetElement* widget_element_frame_create(
+    uint8_t x,
+    uint8_t y,
+    uint8_t width,
+    uint8_t height,
+    uint8_t radius);
+
+WidgetElement* widget_element_text_scroll_create(
+    uint8_t x,
+    uint8_t y,
+    uint8_t width,
+    uint8_t height,
+    const char* text);
+
+#ifdef __cplusplus
+}
+#endif