Bones: ignore uninitialized/zero bone matrices

- validate each SetupBones matrix (finite and non-zero world translation);
  extra/modded and some vanilla bones (Father Grigori) can be uninitialized
  and were drawing lines to world (0,0,0)
- invalid bones are skipped by the skeleton, hitbox centers and aim points;
  skeleton children connect to the nearest valid ancestor instead of a dead
  bone
- log the per-model invalid bone count with the first bones diagnostics

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