Dress every human in the code-built base body and equipment

Replace the Quaternius outfit parts in the client with the code-built base body, its equipment models and the catalog's hand props, for players (offline and online), townsfolk, bandits, the demo's villagers, --lineup and --crowd.

Built: the base body wears every worn item that has a model, all layers at once; what the items cover is dropped before merging (coverage.json as types); one skinned mesh per class (skin, hair, the rest) shared between characters in the same clothes; skin tone and hair colour as material multipliers; the base body's own clips with measured locomotion speeds; prop models in the fists (box meshes only as a fallback). Verified in captures of the demo, the lineup, the cabin fight and Aquais online. Follow-up: body-variants.