add hideTab functionality

[MichaelMCoates]

This PR shows off two things:

1. It was previously stated that you can't attach a name to the platform windows. You actually can, by including the name property in the snapshot.
2. Besides that, here is an example of something you can do to hide the tabs in the "main window" when there is only 1 tab present. This prevents a user from dragging out that tab, which prevents that main window from closing.