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Add UFBGA-32 packages for ATtiny48/88

KiCad Bot requested to merge github/fork/fauxpark/attiny48-ufbga into master

Created by: fauxpark

Going through the ATmega/ATtiny datasheets again looking for missing packages and variants.

t48

Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/doc8008.pdf

The ATtiny48/88 pin positions are a bit unbalanced, but I heard I shouldn't be moving pins around at this stage of the dev cycle. For now I've used the existing layout.

I also renamed the -MMH package to -MMU. H indicates NiPdAu finish on the leads, U is matte tin (page 283) and apparently the default for Atmel MCUs. Not really something that needs to be specified in the symbol name - if it needs to be x'd out I'd like to do that in a seperate PR. I suspect there are more instances.

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