v0.1.0

The first release of the Rust rewrite. It replaces the earlier Python prototype.

Added

• Project Manager: create, open and import projects; search; remove from the list.
• Edit page arranged like DaVinci Resolve's: Media Pool, viewer, Inspector, toolbar,
  timeline, and a page bar at the bottom.
• Timeline with video and audio tracks, markers, snapping, zoom, and a playhead.
• Editing: insert, overwrite, replace, append, place on top, move, trim, ripple trim, blade,
  razor, split, delete, ripple delete, nudge, move between tracks, copy, cut, paste, and
  turning a clip off and on.
• Waveforms on audio clips, worked out in the background and kept on disk.
• An output level meter beside the timeline.
• Cross dissolve between two clips (Ctrl+T), for picture and sound.
• Titles (Text and Lower Third) and fade in / fade out, in the viewer and in export, with
  an Effects panel to add them and Inspector sections to edit them.
• Selecting several clips (Ctrl+click, Select All); a clip and its sound are linked and
  move, trim and delete together; rolling a cut with Shift in Trim mode.
• Dual viewer, and a layout for vertical projects with the viewer in a tall column.
• Filters from plugins (Black and White, Saturation, Brightness, Contrast, Blur, Warm come
  built in): added from the Effects panel, adjusted in the Inspector, shown in the viewer
  and in export.
• Upload targets from plugins, listed under Share on a finished export, limited to the
  sites the plugin names.
• Inspector: drag left or right on a setting's name to change it live; the drag is one undo
  step.
• Project Manager: rename, duplicate, show in Files, move to Trash.
• Preferences: autosave interval, playback quality, automatic proxies, cache.
• Lua plugins: sandboxed scripts that add commands to the menu and change the timeline as
  one undo step. A Remove Silence plugin is built in.
• Optional hardware (VA-API) decoding and encoding, off by default, falling back to the
  processor when the graphics driver cannot be used.
• A dialog to find media files that have moved.
• A one-time hint for first-time users.
• Undo and redo for every edit, marker and track change.
• Viewer with a source mode for previewing Media Pool clips and marking In and Out.
• Preview sound through PipeWire. The picture follows the audio clock.
• Inspector: zoom, position, rotation, opacity, volume and pan.
• Background 540p proxies for footage above 720p or not in H.264. Export always uses the
  original files.
• Markers with name, colour and note. Named markers become chapters in the exported file
  and can be copied as a timestamp list, with YouTube's chapter rules checked.
• Export page: outputs chosen by frame shape (16:9, 16:9 4K, 9:16, 1:1, 4:5), a render
  queue, Fit or Fill when the shape differs, and Quick Export.
• Keyboard shortcuts matching DaVinci Resolve 20, checked by a test against a key file
  exported from Resolve.
• Autosave every two minutes, and an offer to restore unsaved work after a crash.
• Its own icon set, so the interface looks the same under any system icon theme.
• AppImage, Flatpak, .rpm and .deb packages with SHA-256 checksums. The release workflow
  installs each one and starts Tempo from it before publishing.

Changed

• Decoding runs on a background thread; the interface never waits for it.
• Nothing is decoded while paused.
• Video is decoded with frame threading and scaled straight to the preview size.
• Scrubbing shows keyframes while dragging and the exact frame when the pointer rests.
• The viewer is drawn by GTK on the graphics chip, replacing a path that copied each frame
  to the graphics chip and back.
• Export is done by FFmpeg from the original files, replacing a path that produced blank
  frames.

Removed

• The Cut page; editing happens on the Edit page.
• The wgpu renderer, the WebAssembly plugin host and the Python helper, none of which the
  editor used any more.