This adds the blerc data from merc models to the GLB export as shape
keys, also including the data from animations. Blender is unfortunately
a bit weird about this and only really lets you change what animated
weights are used via the NLA track editor by selecting both the
corresponding armature animation and then the one for the shape keys.
Additionally, due to the way the Blender GLB import works when you have
animated weights on a model + animations as actions for an armature, any
models that have blerc data get an extra useless empty, but this seems
to be harmless.
This PR also fixes materials that use texture animations so they now
have their base texture in the export, rather than using the default
material. Materials now also get named after their base texture for
easier recognition.
In some rare cases, the master art group and model names do not match
for some animations (`collectables-ag` is a prime example for Jak 2/3,
which contains multiple different models).
Adds support for exporting animations for foreground models. It's not
perfect and doesn't handle the Jak 2/3 animations very well in some
cases (scale can often get messed up, especially for the LZO compressed
ones, I have no idea what is going on with the data in those art groups
sometimes, so that'll have to be revisited later...), but it does a
decent job on Jak 1.
Additionally, the `build-actor` tool has also been changed to support
setting the `master-art-group-name` and `master-art-group-index` fields
to allow for custom art groups to link their animations to a different
master art group, which lets you add custom animations to vanilla art
groups.
Hat Kid