ThinPowderLeftovers

What's Changed

• [WIP] adding rigid contacts by @EveCharbie in #55
• Walking reconstruction example by @EveCharbie in #54
• fix when no mass by @Ipuch in #59
• fix: when only one marker in the biorbd model it was failing by @Ipuch in #60

New Contributors

• @EveCharbie made their first contribution in #55

Full Changelog: 1.3.6...1.3.7