Added new library and new part ATSAM4S4C

New Library with new part. Microchip ATSAM4S4C mcu.

The part consists of two units.
Unit A

Unit B

Footprint: LQFP100

Datasheet: https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/Atmel-11100-32-bitCortex-M4-Microcontroller-SAM4S_Datasheet.pdf

Product page:
https://www.microchip.com/en-us/product/ATSAM4S4C

In Unit A enough distance is kept between pins to improve schematic readability.

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