inkcpp 0.1.9

What's Changed

• Update ubuntu 20.04 runner. by @kalmard0 in #106
• Don't use std::string::starts_with. by @kalmard0 in #105
• More dynamic memory allocation by @JBenda in #110
• UE 5.6 by @JBenda in #119

Full Changelog: v0.1.8...v0.1.9