martin frances

> Would it make sense to add this for 0.8? Might give people some time to upgrade In #2767, the current propposal , the examples and the benchmark sub-modules bump...

Sorry for the commit spree ... finally found the path out of the woods.

> You may add MSRV to each example's Cargo.toml, not the workspace. Ok ... change is comming

>you might want to hold off on the merge conflict resolution until we get a consensus about upgrading MSRV Understood - It only took me a short time to reconstruct...

I looked over this PR .. and all looks ok In particular the changes to DEFAULT_MATERIAL and DEFAULT_SAMPLER look great