v1.10.0-rc.3

Changes since v1.10.0-rc.2

• fix(editor): give the timeline clip's delete icon the same dark-chip treatment as its label
• feat(compositor): let a text region pin an edge instead of centring its block
• fix(captions): place captions by anchor and margin, not by an invisible band
• test(compositor): anchor on the line box, not on the last pixel of ink
• fix(captions): reserve the plate's margin on the anchored side, and migrate insetX
• fix(compositor): a doc comment cannot sit on a function parameter
• fix(captions): let the first write know the output aspect too
• docs(captions): describe the anchor model on the release branch too
• fix(captions): default the insets to what actually sits well with the padding

Full Changelog: v1.10.0-rc.2...v1.10.0-rc.3