Convert EProtocol to scoped enum and drop E_UNKNOWN_PROTOCOL.
Convert ToggleButtonToolbarController::Style to scoped enum and drop
STYLE_TOGGLEBUTTON.
Convert TargetHelper::ESpecialTarget to scoped enum and drop
E_NOT_SPECIAL.

Change-Id: I412adacac15192cf6563ce4d5e5b74bfffff4737
Reviewed-on: https://gerrit.libreoffice.org/33949Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>