scope

• changed ScopeKey ctors so they are consts. The examples that show them being consts are now correct.

• updated dev dependencies.

• Fixed an error in the README example. Use of wrong type.
• Cleared out a few lint fixes.

• update links to doc and repo.

• upgraded dependencies

• upgraded to dart 3.0.

• BREAKING: The Scope.run method is now asynchronous. Use Scope.runSync to run a synchronous method. You will likely have to change how you call the run method. If you have been using something like:

  
    final scope = Scope()
      ..value<int>(keyAge, 10)
      ..run(()  {
      Future.delayed(oneSecond, () {
        print('Age: ${use(keyAge)}');
      });
    });
  

  You will need to change it to:

    final scope = Scope()
      ..value<int>(keyAge, 10);
  
    await scope.run(() async {
      Future.delayed(oneSecond, () {
        print('Age: ${use(keyAge)}');
      });
    });
  

• added copyright notices.

• Created an example of how overrides work.

• Changed the debugName on ScopeKey.withDefault to optional to match ScopeKey.

• Added missing types from global scope unit tests.

• Added a GlobalScope object which implements a Singleton pattern which can be overriden by injecting a Scope.

• Improved debug messages for ScopeKeys by providing the type and debug name if available.

• ENH: Added new method hasScopeValue
• ENH: added withDefault argument to use to provide site specific defaults
• BREAKING: Subtle change to method hasScopeKey. Previously it return true if the key was in scope or if it had a default value. Use hasScopeValue to get the original implementation and use hasScopeKey to check if a key exists.

• purged singleton from the doc as it is now single.

• purged the term generator for the code/doco as it should be sequence.

• Deprecated factory in favour of single. Added sequence in favour of the originally planned generator.

updated description again.

• renamed packaged to scope.