writerfilter: salvage a field parameter parsing train wreck

Field parameters get horribly maimed by lcl_ExtractParameter which
clearly has never worked in its 7 years of existence (and looking at the
inanity at the call sites makes one wonder what the author was smoking).

The format is actually quite annoying, since spaces between parameters
are optional.

The old RTF filter was at least able to parse "PAGEREF bookmark" fields,
so this fixes such regressions (related: rhbz#1065629).

Change-Id: I9b2e32c3c7264be0fc1077cb8fb3f1bc5c1955bb

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