config: implement reading app-specific configs from profile

src/Config.cpp

@@ -146,6 +146,9 @@ ConfigService::loadProfile(const char* profileName)
       Log.warning("config: Could not load profile %s!", profileName);
     }
 
+    JsonObject defaults = jsonConfig["defaults"];
+    MainLoop::instance()->dispatch(InputEvent{InputEvent::ConfigurationChanged, &defaults});
+
     String configName = jsonConfig["surfaceMap"];
     jsonConfig.clear();
     loadMap(configName);