* PHY status API for W5500 & ENC28J60 drivers
* move linkStatus() from ArduinoEthernet:: to LwipIntfDev::
* LwipIntfDev: include PHY status into ::connected()
* make WiFi/Ethernet interface compatible with Arduino Ethernet API
provide some minimaly adapted examples from legacy
* move ethernet compat globals to EthernetCompat.h
* LegacyEthernet: add UDP example
* adjust comments
Co-authored-by: Max Prokhorov <prokhorov.max@outlook.com>