[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/notification/notification_app.h

@@ -0,0 +1,59 @@
+#include <furi.h>
+#include <furi_hal.h>
+#include "notification.h"
+#include "notification_messages.h"
+#include "notification_settings_filename.h"
+
+#define NOTIFICATION_LED_COUNT 3
+#define NOTIFICATION_EVENT_COMPLETE 0x00000001U
+
+typedef enum {
+    NotificationLayerMessage,
+    InternalLayerMessage,
+    SaveSettingsMessage,
+} NotificationAppMessageType;
+
+typedef struct {
+    const NotificationSequence* sequence;
+    NotificationAppMessageType type;
+    FuriEventFlag* back_event;
+} NotificationAppMessage;
+
+typedef enum {
+    LayerInternal = 0,
+    LayerNotification = 1,
+    LayerMAX = 2,
+} NotificationLedLayerIndex;
+
+typedef struct {
+    uint8_t value_last[LayerMAX];
+    uint8_t value[LayerMAX];
+    NotificationLedLayerIndex index;
+    Light light;
+} NotificationLedLayer;
+
+#define NOTIFICATION_SETTINGS_VERSION 0x01
+#define NOTIFICATION_SETTINGS_PATH INT_PATH(NOTIFICATION_SETTINGS_FILE_NAME)
+
+typedef struct {
+    uint8_t version;
+    float display_brightness;
+    float led_brightness;
+    float speaker_volume;
+    uint32_t display_off_delay_ms;
+    bool vibro_on;
+} NotificationSettings;
+
+struct NotificationApp {
+    FuriMessageQueue* queue;
+    FuriPubSub* event_record;
+    FuriTimer* display_timer;
+
+    NotificationLedLayer display;
+    NotificationLedLayer led[NOTIFICATION_LED_COUNT];
+    uint8_t display_led_lock;
+
+    NotificationSettings settings;
+};
+
+void notification_message_save_settings(NotificationApp* app);