Export, Media: codecs and containers from craft-libs; remove hevcenc, av1enc, vp9enc (#3522)

* Export, Media: H.264, ProRes, HEVC, VP9, AV1, AAC, MP4 and Matroska come from craft-libs

crates/export and crates/media use craft-video, craft-audio and craft-media
(one craft-libs rev) instead of filmcraft-h264enc, -prores, -aac, -isobmff,
-matroska and -opus. The av1enc, hevcenc and vp9enc crates are removed:
craft-video carries the same encoders, with the later changes merged in
storytold/craft-libs#829. Their round-trip tests move to crates/export/tests
and run against craft-video.

opusenc stays (craft-libs has no Opus encoder yet), as do filmcraft-mpegts
and the filmcraft-vp9, -hevc and -av1 decoders the tests use as oracles.

* Pin craft-libs at the main commit that has the encoder colour description (e7c3dda7)

docs/architecture.md

@@ -18,10 +18,7 @@ cpal or muda. Everything in L0 to L4, the egui UI and the web app also build for
 | L0 | `time` | `Tick` (254 016 000 000 per second), rational frame rates incl. NTSC, SMPTE and drop-frame timecode |
 | L0 | `geom` | Vectors, matrices, quaternions, the layer transform (anchor, position, scale, orientation, rotation) |
 | L0 | `color` | sRGB and linear, HSL/HSV, luminance, the 38 blend modes, label colors |
-| L0 | `vp9enc` | VP9 encoder (profile 0, 8-bit 4:2:0, key and inter frames with motion search, loop filter and rate control; lossless at quality 100) for WebM export, from the VP9 bitstream specification |
 | L0 | `opusenc` | Opus encoder: RFC 6716 SILK (NB/MB/WB), hybrid (SWB/FB) and CELT (FB) modes chosen by bitrate and application (audio / voice), 48 kHz 20 ms packets, mono/stereo, and the RFC 7845 `OpusHead`, for WebM export audio |
-| L0 | `hevcenc` | HEVC (H.265) encoder from ITU-T H.265: Main / Main 10 4:2:0, IDR + P slices (quarter-pel motion, merge/AMVP), CABAC, deblocking, bitrate or constant-QP rate control, for MP4 (`hvc1`) export |
-| L0 | `av1enc` | AV1 encoder from the AV1 bitstream specification: Main profile 8/10-bit 4:2:0, key + inter frames (quarter-pel motion), deblocking, for MP4 (`av01`) and WebM export |
 | L1 | `raster` | Premultiplied float images, sampling, affine and projective warps, blurs, compositing (parallel with rayon) |
 | L1 | `keyframe` | Animated values, keyframes with temporal ease and spatial Bezier, roving, hold, velocity |
 | L1 | `segment` | Swappable trained models for Roto Brush and face tracking: the `MaskModel` and `FaceModel` interfaces, a registry of open-licensed models (authors, licence, URL, size, SHA-256), PyTorch checkpoint and TensorFlow Lite readers (with an interpreter), SHA-256, MobileSAM (TinyViT + Segment Anything decoder) and MediaPipe Face Landmarker (BlazeFace + Face Mesh V2) on rayon and ndarray's safe GEMM |