Fix STM32 support and add support for Raspberry Pi Pico and other rp2…

…040 boards

library.properties

@@ -4,7 +4,7 @@ author=Renzo Mischianti <[email protected]>
 maintainer=Renzo Mischianti <[email protected]>
 sentence=Most starred PCF8574 library for Arduino (standard and SAMD), ESP8266, smt32 and esp32  
 paragraph=Most starred PCF8574 library. i2c digital expander for Arduino (standard and SAMD), esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.
-category=Sensors
+category=Signal Input/Output
 url=https://www.mischianti.org/category/my-libraries/pcf8574/
 repository=https://github.com/xreef/PCF8574_library
 architectures=*