Hybrid and Central GHP, Apache 2.0 License

What's Changed

• Centralized ghp, hybrid ghp, ghp residual value by @lixiangk1 in #272
• 264 enable hybrid ghp capability in reopt by @rathod-b in #271
• Update scenario.jl by @rathod-b in #275
• Update CHANGELOG.md by @rathod-b in #277
• v.0.34.0 by @rathod-b in #276
• Switch to Apache 2.0 License for OSI-Approved by @Bill-Becker in #278
• Change License to Apache 2.0 for OSI-Approved by @Bill-Becker in #279

Full Changelog: v0.33.0...v0.34.0