Improve the name of the Dart standard library package.

Change-Id: I220588eede0e119c9b502152daedc13cc27c3998
Viewpoints selection in the new project wizard

Bug-Url: https://github.com/dartdesigner/Dart-Designer/issues/45
Change-Id: Id1f5812d56b8cf16b4c04d4ba15ad4bd2eae7225