Add implicit ubo/ssbo layout to qualifiers slot

[mfiano]

When a uniform struct is given :ubo or :ssbo without an explicit packing layout, :std-140 is implied in the glsl source. I request that when left out, we explicitly add it to the qualifiers slot so that it can be queried from lisp.

[cbaggers]

Agreed. I'd like to do this in #'make-stage so it can be reviewed before being passed to translate. I wonder what other things we can expand here.

Thanks for the issue report

[cbaggers]

Fixed on feature/remove-qualifiers-from-vars