Generate JEDEC DO-219 packages

[eduardosm]

Based on https://www.jedec.org/sites/default/files/docs/do-219b.pdf

Named according to:

SODFL37X18X130L8X11:

SODFL37X18X98L6X11:

[ubruhin]

Oh, is there actually any difference between the existing DO generator and the new one, beside the STEP model and metadata (name, description)? If not, honestly I would prefer to have only a single generator which is able to generate both, since the difference is so small (less duplicate code, less scripts to maintain). It shouldn't be hard to generate different STEP models depending on the lead style. See for example generate_dip_switches.py which also supports different lead styles with the classes ThtLeadConfig and GullWingLeadConfig.

I see that we will have to improve the script anyway some day since it doesn't support the IPC density levels yet. Once we do this, we would be happy to have only a single script that needs to be updated 🙈

[eduardosm]

Changed to be a single generator