Fix build flags, update core

This MR fixes the fact that you couldn't build the framework with just cmake .., because the USE_* weren't used consistently. This should be fixed now. I also introduced new CI jobs to test this, and to execute all the examples

approved this merge request

To which version of the core this MR is pointing now?

approved this merge request

@jhrdinka e38544e5a1a9c183ce1efb5269d1b9004c34d44b, which is a bit older. We can certainly update the FW, but that's orthogonal to what this MR wants to do. Ok with you?

merged

mentioned in commit 3dcdcc21