0.8.0

For Swift 5.9, Xcode 15.0.

Milestone: https://github.com/inamiy/Actomaton/milestone/14?closed=1

What's Changed

• [CI] Use Xcode 15.0 (Swift 5.9) by @inamiy in #79
• Use Swift 5.9 custom executor by @inamiy in #80
• Include ActomatonDebugging as ActomatonUI library target by @inamiy in #81
• Update Package.swift to comment-out unsafeFlags by @inamiy in #82

Full Changelog: 0.7.1...0.8.0