v0.7.0

Layers: build a bone out of several meshes, each sculpted, placed and named on
its own.

Added

• Layers — multiple meshes per bone. A bone can now carry several meshes (a
  base mesh plus extra layers), each one:
  • sculpted on its own — pick the active layer in the Layers panel and the
    voxel tools edit it;
  • placed by its own offset — translate / rotate / scale it numerically, or
    drag it against the posed bone with "Move layer" (Skeleton mode);
  • named — rename it in the panel (names are saved with the project);
  • drawn together in the Skeleton / Animate preview.
• Extract to layer — carve the current selection into a new layer on the
  same bone (it stays exactly where it was), the layer counterpart of "Extract
  to bone".
• Copy / paste across bones and layers — copying voxels from one mesh and
  pasting into another (a different bone, or a layer) now lands the paste inside
  the target instead of off its edge.

Changed

• Bumped roxlap to 0.15.0 — its animated-voxel-clips character container and
  renderer are what layers build on (a bone's layers map to the engine's
  per-bone attachment list).