* Upgrade audioplayers to latest
There have been some important fixes recently. This fixes#1315.
Also, a fly-by upgrade of two other dependencies.
* Delete .gitignore “heading”
Just removed the old `ios/`, `macos/` and `android/` folders and recreated them using `flutter create .`, then massaged the runners back into working order.
* Changes to package import statements
Without these changes to the package import statements, if a user uncomments the FirebaseCrashlytics code, they will get a bunch of errors.
* Commented out import statements & added instructions
* Update crashlytics.dart
Upgrade Crashlytics.dart to use recently released fatal crash APIs
https://firebase.blog/posts/2022/07/whats-new-in-crashlytics-for-flutter
* Ran dart format on changed files
Adds a template / sample for games built in Flutter, with all the bells and whistles, like ads, in-app purchases, audio, main menu, settings, and so on.
Co-authored-by: Parker Lougheed
Co-authored-by: Shams Zakhour
