chore(color): Replace dynamic_cast with virtual functions, disable RTTI to reduce FLASH usage (#3885)

* Replace dynamic_cast with virtual functions and disable RTTI.

* Cleanup TopBar class hierarchy.

* Fix compiler warning.

radio/src/lua/widgets.cpp

@@ -376,7 +376,7 @@ void luaUnregisterWidgets()
 {
   std::list<const WidgetFactory *> regWidgets(getRegisteredWidgets());
   for (auto w : regWidgets) {
-    if (dynamic_cast<const LuaWidgetFactory*>(w)) {
+    if (w->isLuaWidgetFactory()) {
       delete w;
     }
   }