Wagna: added three houses according to local source with fixme for floorplan

Wagna: small corrections according to local source

Münster: solved note https://www.openstreetmap.org/note/4684544

Münster: solved note https://www.openstreetmap.org/note/4687009

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Münster: connected building and added building:parts

Münster: various smaller corrections on buildings, deleted a non-existant crossing

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