Swift 5.10 Release

What's Changed

• merge in changes from cmark-gfm 0.29.0.gfm.11 by @QuietMisdreavus in #51
• Revert "merge in changes from cmark-gfm 0.29.0.gfm.11" by @QuietMisdreavus in #53
• Un-revert #51 and fix Windows build errors by @QuietMisdreavus in #55
• Fix excluded required source file in cmark-gfm by @luispadron in #60
• integrate changes from cmark-gfm 0.29.0.gfm.12 and gfm.13 by @QuietMisdreavus in #61

New Contributors

• @luispadron made their first contribution in #60

Full Changelog: swift-5.9.2-RELEASE...swift-5.10-RELEASE