v0.7.0

What's Changed

• adjust composition of merged calls by @dharmab in #333
• remove extra common in stacks composition by @dharmab in #337
• Don't age out trackfiles if faded calls may be pending by @dharmab in #338
• Protect center point with lock by @dharmab in #339
• Tune alternate words by @dharmab in #341
• Change voice-playback-speed from enum to float by @dharmab in #342
• Simplify merged call by @dharmab in #343

Full Changelog: v0.6.7...v0.7.0