test_app.dart : use a Future to delay the disposal of the window to workaround #77
redux of the files-test branch
Merge pull request #79 from dart-gde/files2

redux of the files-test branch
some tweaks to convert some APIs to a more std format
Remove references to deprecated dart:json library.

Cleanup warnings in touched files.
Merge pull request #80 from dart-gde/cleanups

some tweaks to convert some APIs to a more std format
Merge pull request #81 from DrMarcII/deprecation

Remove references to deprecated dart:json library.
suppress many analyzer warnings

the ones that remain are all legitimate issues that need to be
addressed, I believe
suppress warnings in windows.dart

missed this file in my previous commit
Merge pull request #82 from rmsmith/warning_suppression

Warning suppression