need a configuration builder to inline includes

[rbuels]

In large installations like @scottcain manages, when there are huge numbers of configuration files that are imported into each other using include, the initial JBrowse load can be quite slow, because it has to fetch many many configuration files.

We should make a node module that includes a script that can take a root .conf and a root .json file, traverse all the includes, and produce a single "built" JSON configuration file (this would translate .conf files to JSON as well)

[scottcain]

I've thought about doing this by hand, especially when I've tested a webpack version of JBrowse, since the time spent getting config files becomes even more noticeable. I would love having something like this.