The Studio viewer now covers everything the classic overlay did, so the
classic runtime (toolbar, panzoom, A/B and side-by-side engine, scopes,
loupe, probe, grading and WebGL video processors, filmstrip, context menu,
keyboard handling), its styles and its tests are deleted.
- Every open request goes to the Studio viewer; requestViewerOpen no longer
falls back to a viewer singleton.
- Drop the classic-only settings (use classic viewer, pan without zoom,
disable WebGL) and their internal options and constants.
- Studio tells the grid which asset it ended on when it closes, and the
rating hotkeys yield to it while it is open.
- Remove dead helpers left behind (image processor, media player helpers,
3D helpers, metadata block, viewerbar controls variant) and unused CSS.
- Update the viewer tutorial, hotkeys doc and changelog.
Ewald ALOEBOETOE
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