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of playing around for performance, and finally decided to not union
anything in the parser, but to union the contents of modules and the
output of loops via the blockscad code generators (because they did it
less stupidly than the parser).  Also, I no longer return a 'display mesh'
before doing all unions at the end - I just do them.  There is still a
performance benefit from doing them in batches.
This seems to be a good compromise for models with 100000000 objects (that
crash the machine on polys) vs. waiting for all the unions at the very
end.
I also fixed the rounding error in loop index var. when sent to text.
I forgot to add internationalized messages for "Parsing...".  I'll do that
next.

get the parser to work correctly.

the parser into the worker.

flow.  The idea being that while I'll need to union them to prepare an
STL, to just see the model it isn't critical.  Right now there are no
implicit unions anymore except in the top bay of a difference and every
bay of an intersection, and it is a TERRIBLE HACK.  This version does not
make an STL, so you can't download a model.

as well as the "code with no shape" bug that appears in recursion.  I also
changed the code generated for rotation, translation, and scaling to
eliminate empty transformations (rotating by 0 degrees, etc).

selected on page reload.

fixed typing bug with variables and the ternary block.

output for openScad.  Internal assigns still used - this is a parser
workaround, not a parser update!

project view.