New symbols: STTH212S and STTH212U

[atari91]

• Two new diodes:
  • STTH212U in SMB Package
  • STTH212S in SMC Package (same characteristics except of a decreased R_th compared to the SMB package)

• datasheet: https://www.st.com/resource/en/datasheet/stth212.pdf
• Travis automated check scripts: No error/warning

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All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.

[evanshultz]

Welcome and thanks for contributing!

For the SMB diode I think we already have a symbol that will work, so instead of a new symbol you can add the parts as an ALIAS to an existing symbol. STTH212U can be an ALIAS of S2JTR. The SMC diode looks good. Let us know if you need help setting up the ALIAS thing.

[CLAassistant]

All committers have signed the CLA.

[atari91]

Thanks for the review,
I put the STTH212U diode as an alias into the lib.

Commit 68946c4 (merge) does not change any files. I had to adjust some git settings and this extra merge was generated somehow.

[evanshultz]

Looks good. Thanks and we hope you'll continue to contribute!