Small changes/tweaks, including improvements to map mesh masks.
- Fix Yendor rise animation duration; it was too long.
- Add generic Cthulhu peep.
- Rename the god peeps.
- Expose map mesh masks in map editor.
- Improve map mesh functionality by adding more masks & allowing a map to have multiple masks.
- Add support for animation blending between different animations.
- Add a silly voice app, including offline and realtime voice-to-lip animations. Maybe this functionality will be useful in the game one day...
- Add mouth frames to chest mimic & tinkerer.
- Fix animation support for degenerate meshes in Goober (the animation tool).
- Improve argument parsing at start up.
- Fix serializing the `data` field in tiles.