added archive packer

[Thecoolpeople]

I added the first version of the archive packer.

@vadimkantorov: for packing the fonts ( font compilation / generation / other post processing ). It's the question, if this can be done on the client itself, or if that has to be made at the packaging part.

[vadimkantorov]

Could you please add argparse argument parser and encode all needed constants as default values of arguments in argparse configuration.

Also, most importantly, please add in argparse some sort of usage example and explanation of when this is useful. As I said, in the general situation, simply extracting packages is not sufficient because some programs/perl scripts must be run for preprocessing the fonts and busytex can't run these during the in-browser operation (and I haven't tried how it might work in x64 operation). It might be true that for some usecases your packaging is sufficient - but please be sure to explain clearly what is this usecase and what are the limitations.

Also, at the current time, busytex cannot consume directly tarball/archive-packed LaTeX installation. Either you would need to use some sort of FUSE-based virtual FS for mounting this archive or you would need to extract it prior to usage or maybe you would need to use a LD_PRELOAD-based virtual FS. Please explain the usage mode you have in mind.

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Also, currently busytex master isn't ready for use as I was doing some experiments with build scripts. I'll try to create some sort of release branch for pointing to a stable commit and then do experiments not on the main branch.