tworingtools 6.1.0

- xcsims: Delete all simulators and recreate one for each compatible platform and device type pairing. - sync-git-remotes: Make sure all your GitHub repos are cloned into a given directory and keep them synced with upstream. Forks are maintained with a remote for both the fork and upstream, both remotes' default branches are tracked in local counterparts, and the upstream default branch is also pushed to the fork. - changetag: Extract changelog entries to write into git tag annotation messages. - prerelease-podspec: Branch and create/push a release candidate tag, modify the podspec to use that version tag, and try linting it. - release-podspec: Create a tag with the version and push it to repo origin, push podspec to CocoaPods trunk. - revert-failed-release-tag: In case `release-podspec` fails, make sure the tag it may have created/pushed is destroyed before trying to run it again after fixing, so it doesn't break due to the tag already existing the second time around. - bumpr: Increment the desired part of a version number (major/minor/patch/build) and write the change to a git commit. - clean-rc-tags: deletes any release candidate tags leftover after prerelease testing. - migrate-changelog: for a changelog adhering to [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), move any contents under Unreleased to a new section for a new version with the current date.