- Introduce SWT flag SWT.IE to be used for Browser to create an Internet
  Explorer instance
- Adapt mapping of existing VM argument for default browser to map "ie"
  to new Internet Explorer flag and use Edge as default
- Make SWT Browser instantiate Edge on Windows by default, i.e., unless
  the flag SWT.IE is specified
- Adapt the SWT ControlExample to represent the SWT.IE flag and properly
  switch between Edge, Internet Explorer and default
- Adapt Browser tests to consider to new default configuration

Contributes to
https://github.com/eclipse-platform/eclipse.platform.swt/issues/1466