Issue #195

Introduces compile-time substitutions that make it impossible for the program to reach code that is not really used in jelly-cli, but still bloats the binary size.

Notably, this excludes all HTTP and SSL code used by JSON-LD context resolvers (we don't have to support that...) and Jena SPARQL (this is not used at all). We also trim out unused cyphers, which were included due to Jena using UUIDs for blank nodes.

This reduces the binary size by a further 10MB:

$ ls -lh
-rwxrwxr-x 1 piotr piotr  44M Aug 24 23:11 jelly-cli-skipflow
-rwxrwxr-x 1 piotr piotr  34M Aug 24 23:42 jelly-cli-skipflow-substitutes

Baseline throughput:

$ time ./jelly-cli-skipflow rdf transcode nanopubs.jelly > /dev/null

real    1m56,017s
user    1m47,645s
sys     0m8,306s

With this change applied:

$ time ./jelly-cli-skipflow-substitutes rdf transcode nanopubs.jelly > /dev/null

real    1m56,843s
user    1m48,597s
sys     0m8,226s

So, throughput is basically the same.