PolyItem: simplify; disambiguate fcts

enabled an automatic merge when the pipeline for 6dbcc707 succeeds

aborted the automatic merge because source branch was updated

added 4 commits

• 93bb2337 - rm comment, was outdated after fcts were moved from PolyItem to UtilXML
• bcaa0946 - expand PolyItem::operator->
• 4036c5ff - Footprint + tooltip
• c01eb898 - exempt template lines from cpp style checks

Compare with previous version

merged

mentioned in commit 22552d36