iqm-exm
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add exm specs, update iqm spec with clarifications
iqm's spec leaves some ambiguity which needs to be cleared up, especially by leaving the coordinate system unspecified (i.e. "use blender's").
exm should actually specify that it uses blender's z-up. iqm spec text should be clarified for what it actually does right now.
will need to begin to formalize the metadata block
added the iqm specs with a couple clarifications, i'm sure more would be useful.
exm json is still unspecified, don't rely on it being anything specific (it's currently disabled, regardless)