Update AirLift for Boards and Breakouts

[brentru]

This is a breaking PR for WINC1500 users!

Changes:

• Updated AdafruitIO_WiFi for AdafruitIO_AIRLIFT
• Added configurable pins to AdafruitIO_AIRLIFT for using with breakouts and boards
• Added configurable pins to WINC1500
• Bumped version to 3.1.0

Usage with AirLift

#define USE_AIRLIFT
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS, SPIWIFI_SS, SPIWIFI_ACK, ESP32_RESETN, ESP32_GPIO0);

Usage with WINC1500

#define USE_WINC1500
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS, WINC_CS, WINC_IRQ, WINC_RST, WINC_EN);

This PR has been tested with a PyPortal and a Feather M0 + AirLift ESP32 Breakout

[brentru]

@ladyada OK, change applied to config.hs - tested publish&subscribe with PyPortal, M0 WiFi WINC1500, AirLift Breakout + Feather M0, and Metro M4 WiFi.

[ladyada]

ok sounds good!