highlight.dart
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Background processing for Flutter
This PR adds a HighlightBackgroundEnvironment widget that can be added to the widget tree.
HighlightBackgroundEnvironment uses a background isolate to perform expensive text processing functionality that HighlightView can access through an InheritedWidget.
When HighlightView detects the presence of the aforementioned InheritedWidget, it will automatically use it.
This PR includes #33, as it's dependent on the architectural changes made there.