faster badkb starting: bt init using thread

applications/main/bad_kb/bad_kb_app.c

@@ -151,7 +151,8 @@ BadKbApp* bad_kb_app_alloc(char* arg) {
         app->error = BadKbAppErrorCloseRpc;
         scene_manager_next_scene(app->scene_manager, BadKbSceneError);
     } else {
-        bad_kb_connection_init(app);
+        app->bt_init_thread = furi_thread_alloc_ex("BadKbBtInit", 512, (FuriThreadCallback)bad_kb_connection_init, app);
+        furi_thread_start(app->bt_init_thread);
         if(!furi_string_empty(app->file_path)) {
             app->bad_kb_script = bad_kb_script_open(app->file_path, app->is_bt ? app->bt : NULL);
             bad_kb_script_set_keyboard_layout(app->bad_kb_script, app->keyboard_layout);
@@ -173,6 +174,7 @@ void bad_kb_app_free(BadKbApp* app) {
         app->bad_kb_script = NULL;
     }
 
+    furi_thread_join(app->bt_init_thread);
     bad_kb_connection_deinit(app);
 
     // Views

applications/main/bad_kb/bad_kb_app_i.h

@@ -79,6 +79,8 @@ struct BadKbApp {
     bool connection_init;
     FuriHalUsbInterface* usb_prev_mode;
     GapPairing bt_prev_mode;
+
+    FuriThread *bt_init_thread;
 };
 
 typedef enum {

applications/main/bad_kb/bad_kb_script.c

@@ -646,7 +646,7 @@ void bad_kb_config_switch_bonding_mode(BadKbApp *app) {
     }
 }
 
-void bad_kb_connection_init(BadKbApp* app) {
+int32_t bad_kb_connection_init(BadKbApp* app) {
     app->usb_prev_mode = furi_hal_usb_get_config();
     furi_hal_usb_set_config(NULL, NULL);
 
@@ -674,6 +674,8 @@ void bad_kb_connection_init(BadKbApp* app) {
     }
 
     app->connection_init = true;
+
+    return 0;
 }
 
 void bad_kb_connection_deinit(BadKbApp* app) {

applications/main/bad_kb/bad_kb_script.h

@@ -38,7 +38,7 @@ void bad_kb_config_switch_mode(BadKbApp* app);
 
 void bad_kb_config_switch_bonding_mode(BadKbApp *app);
 
-void bad_kb_connection_init(BadKbApp* app);
+int32_t bad_kb_connection_init(BadKbApp* app);
 
 void bad_kb_connection_deinit(BadKbApp* app);