Various fixes in tools/ to improve code generation

[pallasscat]

Fixed formatting issues (double spaces, excessive newlines, const names) in template output; fixed directory issues and cleaned up code in gen_script.sh; switched to int-based schema version selection and re for code cleanup, minor fixes in generate_from_schema.py.

[pallasscat]

Additionally: do we still need the full template? For example, UnmarshalJSON() method is unnecessary more often than not.

Alternatively, how about re-writing the entire generate.py + schema.tmpl to render enums and objects exclusively? I could try to do it with python3.5+, but it has been years since I switched to golang even for scripting.

[stmcginnis]

Alternatively, how about re-writing the entire generate.py + schema.tmpl to render enums and objects exclusively? I could try to do it with python3.5+, but it has been years since I switched to golang even for scripting.

That sounds reasonable. These scripts were left over from when the project was first started and probably are due for a complete overhaul. I would be fine if you want to make some larger changes.

Thanks a lot for looking into this!