* Add craft-aep: After Effects project container and typed view from EffectCraft
The .aep (RIFX 'Egg!') and .aepx container as a lossless chunk tree that
writes back byte for byte, and the typed, read-only view over it:
compositions, layers, properties, keyframes, effects and their settings
data, masks, shapes, text documents, markers, cameras, track mattes,
footage, project settings and the saving version.
Moved from effectcraft crates/aep/src/container at f6b4da0a with its unit
tests, the container integration tests, the aepdump and stubicc tools and
docs/aep-format.md. The match-name tables (effect_map, style_map), the
importer and the exporter are written against EffectCraft's model and
stay there. ExtractorChannels::sources takes the caller's name for a
copied channel instead of an EffectCraft constant.
* craft-aep: read the Photoshop layer a footage item shows
A footage item made from one layer of a .psd stores the layer in its
`opti` (tag `8BPS`): the layer record's index (big-endian i32 at 14, -1
for the merged image), the document's two sides (little-endian u32 at 32
and 36), the layer's bounds (little-endian i32 at 78, 82, 86, 90) and its
name (UTF-8 from 344). `Footage::psd_layer` reads them as `PsdLayer`.
The format part of storytold/effectcraft#3449; the importer's use of it
stays in EffectCraft.
---------
Co-authored-by: arnav-hiwarkar <asharnav2008@gmail.com>
