Add api method to get wiki url from page title

[tholzheim]

Please note that simply using the scriptpath might not work. The current configuration of OpenResearch is an example for this. It might be that we have to add another field to wikiuser that optionally holds the correct formatting string for how an enduser "sees" the wiki. This might also be useful for WikiCMS. You'll never now what kind of url rewrites are done on some wikis - there is no standard for that. The scripts/index.php?title=pagetitle version is pretty generic but leads to ugly urls.

[WolfgangFahl]

see https://github.com/mediawiki-utilities/python-mediawiki-utilities/blob/master/mw/lib/title/functions.py for one of the functionalities needed (convert spaces to underscore) - there are lot more things to do like url_encoding html chars and so on ..

[WolfgangFahl]

see also https://stackoverflow.com/questions/63120292/is-there-a-regular-expession-or-similar-simple-approach-for-checking-whether-a-m