Automate connecting a Qt profile to a toolchain profile

Since 23741109032b5030b4ec60d477b65ed92cb3ce49 [Remove support for "global" settings.], I've been getting the following error:

share/qbs/modules/qt/core/qtcore.qbs:60 Binding 'cpp.frameworkPaths' failed, no property 'cpp' in the scope of module qt/core

I wiped my ~/Library/Preferences/com.qtproject.qbs.list, did a completely clean build of qbs, ran `qbs-detect-toolchains` and `qbs-setup-qt --detect` before trying to build a Qt-based project and getting this error.

I tried setting profiles.<name>.qbs.baseProfile to 'gcc' for my Qt profile but then received an error that qbs.baseProfile is unknown (seemingly contrary to the documentation).

I then tried manually adding all of my 'gcc' profile's properties to my Qt profile and that works as expected. I'm guessing that qbs.baseProfile is simply not working, and qbs-setup-qt should probably automatically set a base profile appropriate for any Qt profiles that are set up using --detect.