Feature Request: Esc Key Binding to close exporter window

Since all of the export dialogs in Revit can be closed with the Escape key, it would be nice if that would work for the IFC Export dialog as well.

The issue identifies the IFC Export dialog but names no implementation file or test. Start by locating the dialog's window and its existing close behavior, then compare it with other Revit export dialogs that respond to Escape. Done means Escape closes the IFC Export dialog without changing the existing export workflow, with a regression test if the project has dialog tests.

Written by the indexing model from the issue text.