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Do not allow nullable arrays, which were not correctly implemented

Ian Douglas Scott requested to merge ids1024/wayland:no-nullable-array into main

Nullable arrays, which are not used anywhere, were marshalled the same way as an empty non-null array. The demarshalling logic did not recognize anything as a null array. Given this, it seems better to just explicitly not support it.

Also documents which types are nullable, and how a null string is represented in the wire format.

Fixes #306 (closed).

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