Bad BT plugin, Submenu locked elements, API updates, etc.

Thanks to WillyJL, ClaraCrazy, and XFW contributors

applications/external/bad_bt/application.fam

@@ -0,0 +1,17 @@
+App(
+    appid="bad_bt",
+    name="Bad BT",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="bad_bt_app",
+    requires=[
+        "gui",
+        "dialogs",
+    ],
+    stack_size=2 * 1024,
+    order=70,
+    fap_libs=["assets"],
+    fap_category="Tools",
+    fap_icon="images/badbt_10px.png",
+    fap_icon_assets="images",
+    fap_icon_assets_symbol="bad_bt",
+)