Refactored manifest onStart/onStop to onCreate/onDestroy (#195)

When writing documentation, I realized how `onStart`/`onStop` isn't clearly communicating what it does (it could imply show/hide), so I renamed it to `onCreate` and `onDestroy`.

Tactility/Source/service/loader/Loader.cpp

@@ -118,7 +118,7 @@ static void transitionAppToState(std::shared_ptr<app::AppInstance> app, app::Sta
         case Initial:
             break;
         case Started:
-            app->getApp()->onStart(*app);
+            app->getApp()->onCreate(*app);
             break;
         case Showing: {
             LoaderEvent event_showing = { .type = LoaderEventTypeApplicationShowing };
@@ -132,7 +132,7 @@ static void transitionAppToState(std::shared_ptr<app::AppInstance> app, app::Sta
         }
         case Stopped:
             // TODO: Verify manifest
-            app->getApp()->onStop(*app);
+            app->getApp()->onDestroy(*app);
             break;
     }