Pull in XPS commits from GhostXPS to MuXPS

This brings MuXPS up to date with GhostXPS as of today.

The commits pulled in are:

  856ecdc    Whitespace fixes for parsing dashed line attributes
  91dc749    Whitespace fixes while parsing points.
               This commit is tweaked from the original, and the
               changes will be pushed back into GhostXPS shortly.
  a298a05    Tiff premultiplied/non-premultiped alpha differences.
               No changes required for this, as we hold images
               premultiplied already (and already cope with
               premultiplying where required). Some changes to
               comments and cleanup code to avoid leaks though.

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