Interpolate skinned limb vertices (horse body and legs) (#7282)HEADdevelop

Matrix interpolation cannot cover SKIN_LIMB_TYPE_ANIMATED limbs: their
vertices are deformed on the CPU and referenced through
gSPSegment(0x08, ...) without any recorded matrix, so recorded matrix
interpolation never moves them.

Record each skinned limb's pose (double-buffered, keyed by the vertex
entry) and blend the previous and current poses for every displayed
frame, right before the graphics commands are run. Ties the blend to a
logical-frame counter so a limb that was skipped for a frame falls back
to its exact pose instead of blending against a stale one.

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