Modified Libraries to add support to QNEthernet for Teensy 4.1 built-in Ethernet

They are ready to be used for both Arduino IDE or PlatformIO

1. EthernetWebServer
2. EthernetWebServer_SSL
3. Ethernet_Manager
4. MySQL_MariaDB_Generic

and the list is growing fast, thanks to the robust and compatible QNEthernet

For more info, check Arduino Forum topic New and Modified Libraries to support Teensy 4.1 QNEthernet