Add plugins.qmltypes file

Task-number: QTBUG-35207
Change-Id: If6843d71c2d6e0a9afec3dca3683ac0fcd1188b6
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Add missing include for QQuickDwmFeatures plugin.

Task-number: QTBUG-35260

Change-Id: I8145fd8a98b8549de7e819740e6b7529d0785488
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Idfe43a75901cf1a29946245bed0956b1541de298