Delete cef_data folder preferences on Brackets uninstall on Windows

This change updates the Windows installer scripts so that uninstalling Brackets on Windows (eg via Control Panel - Programs and Features) will also delete the AppData\Roaming\Brackets\cef_data folder.  It does not remove any installed extensions.

This change was originally provided to EdgeCode by the RE team.  So, just making this change available to Brackets if y'all want to pull it in.