Split FT232H into FT2232HL/FT2232HQ

[twam]

This is the part of #2031 which was not done by #1999.

• Splits FT232H into FT2232HL (LQFP-64, basically previous FT2232H) and FT2232HQ
  (QFN-64 with exposed pad)

Datasheet: https://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT2232H.pdf

FT2232HL:

FT2232HQ:

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[evanshultz]

This PR removes the symbol FT2232H, which we can't allow because it will break that symbol if it's used in existing designs. That is why this wasn't done at #1999.

[evanshultz]

I didn't see your comment at #1999 (comment) first so I didn't realize the reason to change. Good catch. There is a mistake. Let me look at this again. Normally we don't allow symbol changes between major releases, but since this is fixing a bug (CvPcb can't match to the QFN package) I'll go for it.

[evanshultz]

Page 57 of the datasheet shows that the thermal pad must be grounded and all other pins are identical. Looks good. Thanks! Sorry again for not catching the intent of this PR the first time I saw it.

[twam]

That was quick! Big thanks.