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Changed PCF8574 footprint filter, added a package variant

Matyas Mehn requested to merge github/fork/matyas1995/PCF8574 into master

Changed the PCF8574 footprint filters to include package sizes. This symbol covers both the P and T types which only differ in their package, but not in their footprint.

Added PCF8574TS variant with SSOP-20 package as an additional symbol. I created it as an extra symbol because of the incompatible footprint to the existing PCF8574 (P/T) variants in the library.

I did not break up the original PCF8574 in the library into the PCF8574P (PDIP-16) and PCF8574T (SO-16) variants to avoid breaking existing projects which use these symbols. Of course I can do that if required.

PCF8574: grafik

PCF8574TS: grafik

Datasheet under http://www.nxp.com/documents/data_sheet/PCF8574_PCF8574A.pdf

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