move some functions into ProStringList for saner OO design
Change-Id: I60f00f38f459fc9f8eebee9187158e4198fc9546
Reviewed-by:
Joerg Bornemann <joerg.bornemann@theqtcompany.com>
(cherry picked from qtbase/ab74cf09a8f71aa939ac3de6165f9d6b45465ef8)
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