Improve std/generate-std.joke Script

[jcburley]

Avoid conflicts between argument names and internally-generated (reserved) names by prefixing the reserved names with single underscores. (There might be a better approach to this that could be used; this assumes APIs won't use underscore-prefixed argument names., which might be an erroneous assumption.)

Support docstrings with embedded backticks. (Needed by gostd2joker work, but a reasonable thing to do now.)

Support multi-level namespaces, e.g. joker.go.net. (Needed by gostd2joker work, but a reasonable thing to do now.)

Optionally comment out Go code for "empty" packages. (Wanted for gostd2joker work in the past; not sure it'll be needed going forward.)

[jcburley]

Maybe I should bring some of my run.sh changes over from the gostd2joker branch (as a distinct PR)?

[candid82]

Thanks!
RE: run.sh changes. Looks like you call generate-docs and generate-std in your version. I was hesitant to do that because I thought it was not necessary most of the time and it would slow down the build, but perhaps the overhead is negligible (seems to be less than half a second). Feel free to send a PR.