Dart version update above 3 null safety#6

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VladimirCores wants to merge 21 commits intoPureMVC:masterfrom VladimirCores:dart-version-update-above-3-null-safety

+2,613-1,428

Commits on Aug 4, 2023

Linter rules config added
Vladimir Minkin
committed

Commits on Aug 5, 2023

Conform framework to the Dart 3 version. Make tests pass.
Vladimir Minkin
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Use native method containsKey to check existence of the value for commandMap in Controller.
Vladimir Minkin
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Keyword new removed from code.
Vladimir Minkin
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Commits on Aug 13, 2023

Setter for multitonKey returned back
Vladimir Minkin
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Keyword new returned to the comments in places where it was removed by auto-replace.
Vladimir Minkin
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Observer setter corrected - proper target for value - _notifyContext
Vladimir Minkin
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Comments parts in Unit_Tests.dart rearranged to top.
Vladimir Minkin
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Library 'dart:html' and related use of it removed from Unit_Tests as not needed for run of the tests.
Vladimir Minkin
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Add access modifiers for notifyContext and notifyMethod in Observer
Vladimir Minkin
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Unnecessary comment on registerProxy in Model removed.
Vladimir Minkin
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Initialize multitoneKey with constructor input value key through setter in View, Model and Controller.
Vladimir Minkin
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Revert back test on observer.notifyContext
Vladimir Minkin
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Corrections in comments - [_multitonKey] => [multitonKey]
Vladimir Minkin
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Use getter for multitonKey when commandInstance.initializeNotifier (MacroCommand)
Vladimir Minkin
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Setting and accessing multitonKey from access modifiers in Facade constructor.
Vladimir Minkin
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Use access modifiers for multitonKey
Vladimir Minkin
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Open properties of Notification - name, body, type
Vladimir Minkin
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Comments added from previous versions of IObserver
Vladimir Minkin
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Return back tests for properties of observer: observer.notifyMethod and observer.notifyContext.
Vladimir Minkin
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README and VERSION update
Vladimir Minkin
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