Add QTextListFormat::start: html and markdown ordered list index offsetHEADdev

This is useful for a lot of applications that render text coming from
sources which already support arbitrarily numbered lists (like chat
applications for example). Application-side workarounds usually have
significant overhead; and this feature has been requested multiple times.

It should be possible to both read and write HTML with the <ol start="x">
attribute, and read and write Markdown with arbitrary numbers for the
first item in a list.

[ChangeLog][QtGui] QTextList now supports specifying a start index using
the new QTextList::{setStart, start} functions. The HTML start attribute
on ordered lists in rich text documents is now parsed and used when
rendering a text list. Non-negative indices in markdown lists are now
also parsed and written properly. This allows starting a list with a
different number than 1.

Fixes: QTBUG-30407
Fixes: QTBUG-65384
Task-number: QTBUG-107562
Change-Id: Ib35b9378d9134ffedaa2d92f728b0984793aa7c1
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

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