@modelFile attribute

[mzed]

Now that the read method works, it would be nice to also have a read attribute that would load a model at startup.

@model myModel.json ?
@modelFile myModel.json ?
@read myModel.json ?

[mzed]

Max's buffer~ object does this as an argument, which isn't my favorite design. But jit.movie uses @moviefile. Does that suggest @modelFile is best?

[mzed]

sfplay~ uses @audiofile

I'm convincing myself.