-Drive pass selection by face pools. Doing such removes a fair bit of redundant (and often buggy) code.
-Ignore irrelivant batch breakers depending on pass/pool type.
-Face sorting algorithm modified to potentially allow larger batches.
-Removed a few unused/broken things (bake_sunlight/no_materials)
-Fullbright handling should hopefully be a little more consistent.
-Prevent fullbright faces from being placed in 'simple' pool. (They are already simple-er)
Fixed attribute error that popped up with bump faces when batching was disabled.
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