Detach branches on clone

This update of mepo detaches branches on clone. This was always the intent of mepo but was broken at some point.

Also adds --detach as an option to checkout commands since the ability is there now.

Finally, adds a CHANGELOG.

What's Changed

• Merge main back into develop for gitflow by @mathomp4 in #197
• Update LICENSE to Apache, other license changes by @mathomp4 in #199
• Fix license reference in CONTRIBUTING.md by @mathomp4 in #200
• Add changelog and changelog enforcer by @mathomp4 in #204
• Detach branches on clone by @mathomp4 in #205
• Merge Develop into Main for release by @mathomp4 in #206

Full Changelog: v1.37.1...v1.38.0