Add a format property for combing all SWF/FLA to a single library.
Bump the default width of the formats window a bit.
Change the nature and label of the export buttons based on combined setting.
Don't iterate over the export confs twice.
Implement combining libs into a single set of atlases.
Support combining multiple XflLibraries to one LibraryMold.

Currently, the resulting library should have namespaced atlases, but the namespacing is not
yet complete for the MovieMolds.
Namespace all movie names and keyframe refs.
Most of the publish bits done.

Still need to add in the actual usage of publishCombined(), and make sure my code updating
the modified flag is all valid.
Push button to export combined formats.
Toggle enabledness of the export button as well.
Get smarter about when to try publishing.
Log error stack traces.
Vector.map can only return a vector of the same type.

How is that useful? Yet another reason to stop using Vector, I guess, but I'm not going to go
changing the convention in this lib.