[FL-2119] BT HID App (#888)

* view_dispatcher: add default back processing for Long events
* assets: add ble connected and disconnected assets
* bt keyboard: introduce new application
* bt keyboard: add logic to keyboard mode
* bt: remove debug ble hid application
* bt hid: introduce media controller
* gui canvas: rename CanvasFontDirection -> CanvasDirection
* gui canvas: add arrow element
* assets: update finilized assets
* bt hid: finalise keynote GUI
* bt hid: finalise media player GUI
* bt: add media key buttons support
* bt: add exit confirm view
* bt: change Clicker -> Remote
* bt: support f6 target
* bt: hopefully final bt hid design
* bt hid: add blue led notification when device is connected
* bt: leave only bt clicker for now
* bt: add display notification on pin code show event

applications/bt/bt_service/bt_i.h

@@ -12,17 +12,12 @@
 #include <dialogs/dialogs.h>
 #include <power/power_service/power.h>
 #include <applications/rpc/rpc.h>
+#include <applications/notification/notification.h>
 
 #include "../bt_settings.h"
 
 #define BT_API_UNLOCK_EVENT (1UL << 0)
 
-typedef enum {
-    BtStatusOff,
-    BtStatusAdvertising,
-    BtStatusConnected,
-} BtStatus;
-
 typedef enum {
     BtMessageTypeUpdateStatusbar,
     BtMessageTypeUpdateBatteryLevel,
@@ -51,6 +46,7 @@ struct Bt {
     BtStatus status;
     BtProfile profile;
     osMessageQueueId_t message_queue;
+    NotificationApp* notification;
     Gui* gui;
     ViewPort* statusbar_view_port;
     DialogsApp* dialogs;
@@ -60,4 +56,6 @@ struct Bt {
     RpcSession* rpc_session;
     osEventFlagsId_t rpc_event;
     osEventFlagsId_t api_event;
+    BtStatusChangedCallback status_changed_cb;
+    void* status_changed_ctx;
 };