Frameshell 0.15.0

What's Changed

• feat: transitions and keys through nested timelines (#310) by @ThomasPraun in #352
• fix(core): review new timelines and aborted transactions (#328) by @ThomasPraun in #347
• feat: drag to edit composition elements (v0.16, ADR 0021) by @ThomasPraun in #365
• feat: photo segmentation (v0.17, ADR 0022) by @ThomasPraun in #372
• feat: people in the project (v0.15, ADR 0020) by @ThomasPraun in #373
• chore(release): 0.15.0 by @ThomasPraun in #375

Full Changelog: v0.14.0...v0.15.0