Fix #70962: XML_OPTION_SKIP_WHITE strips embedded whitespace

We must never strip embedded whitespace; we only need to skip values
when that option is set, and make sure that we keep BC r

Fix #70962: XML_OPTION_SKIP_WHITE strips embedded whitespace

We must never strip embedded whitespace; we only need to skip values
when that option is set, and make sure that we keep BC regarding the
different behavior for "cdata" and "complete" elements (for the former,
the whole element is skipped; for the latter only the "value" key).

We also fix erroneous `int` types which should actually be `size_t`.

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-7493.

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