add option for speech viewer on startup (#6197)
- Added a checkbox to the speechViewer (consistent with the
welcomeDialog) to toggle launching on startup.
- focus is set to the checkbox so that output to the speechViewer can
start immediatly. The textCtrl was being considered to have focus
even when another window was in focus.
- Changed the speechViewer window to a dialog, in order to fix
navigation issues:
- Now able to alt + tab to the dialog in Windows 10.
- Now able to tab to the checkbox
