Gobbler needs to scan these files, so there definitely is a point to them. If you delete them, Gobbler doesn't find your project. I also believe it makes sense from the way Gobbler works to have them in the same folder of the project file, though I suppose with some effort this might be changed.
I really don't see the problem to be honest. But I'm not the only Sonar user. Everyone is entitled to their opinion. Nonsensical as it may be :p
Seriously, just sort by type, they won't even be in the way anymore, Pick your battles seems the right advice to me.