Reimplement closeToken handling

Idea: Only start unrolling anything on the parser stack
if an element that matches the given close token is found.
This requires the endToken method in DocumentChildHandler
to search for the given descriptor that might be ended.
While performing this search, only a specified number of
"explicit" structures/fields opened by the Stack class may
be skipped (those with implicit default fields).

Added an integration test ("python_code") which requires
this new (hopefully sane) behaviour.

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