I had to move "struct SwHTMLFmtInfo" from htmlatr.cxx to
wrthtml.hxx because there are clear() calls in wrthtml.cxx
and ptr_set needs the full declaration to be visible.

The code frequently inserts at both ends, so a deque made more
sense.

I used a ptr_vector here even though the old code was not
declared with PTRARR_DEL because the lifecycle of the
array elements is completely bound to the lifecycle
of the parent object.

This also triggered the need for some const-ness cleanups.

Change-Id: I74aae3f422423de09cb012e274f8d536f8b778f1

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