perf+install: speed up igneous import time by dropping trimesh

Trimesh is no longer needed.

Author: william-silversmith

igneous/tasks/mesh/multires.py

@@ -32,7 +32,6 @@
 import DracoPy
 import fastremap
 import pyfqmr
-import trimesh
 import zmesh
 
 from .draco import draco_encoding_settings

requirements.txt

@@ -23,6 +23,5 @@ shard-computer
 tinybrain>=1.5.0
 task-queue>=2.4.0
 tqdm
-trimesh[easy]
 xs3d>=1.12.2
 zmesh>=1.9.0,<2.0