Bundle Loading Indicators/Notifications

[MCBTay]

• Added small loading indicators for loading asset bundles.
  • Displays Loading built in bundles... for 1 second when it begins loading the built in bundles.
  • Displays Loaded built in bundles. for 3 seconds when it completes loading the built in bundles.
  • Displays Loading x user bundles... for 1 second when it begins loading the user bundles.
  • Displays Loaded x user bundles. for 3 seconds when it completes loading the user bundles.
• Added missing await when starting coroutine to load user bundles.
• Added dependency on modio.UnityPlugin.dll for the toast notifications.