Workaround for crash receiving ISnapshotDeletedEvent, ISnapshotCreatedEVent and a bunch of other 'empty' event interfaces when using VBOX_WITH_MIDL_PROXY_STUB=1.

git-svn-id: http://www.virtualbox.org/svn/vbox/trunk@50857 cfe28804-0f27-0410-a406-dd0f0b0b656f
tstCAPIGlue dependency fix.

git-svn-id: http://www.virtualbox.org/svn/vbox/trunk@50858 cfe28804-0f27-0410-a406-dd0f0b0b656f
wddm: remaining bits for new command submission

git-svn-id: http://www.virtualbox.org/svn/vbox/trunk@50859 cfe28804-0f27-0410-a406-dd0f0b0b656f
FE/Qt: Global settings: Input page: Shortcuts filtering: Do not erase/add shortcuts if list is empty.

git-svn-id: http://www.virtualbox.org/svn/vbox/trunk@50860 cfe28804-0f27-0410-a406-dd0f0b0b656f