Support for Arudino GIGA WiFi

Added support of Arduino GIGA WiFi.
Section MBED microcontrollers.

`
// Arduino MBED microcontrollers configuration LIKE Arduino GIGA
#ifndef DEFAULT_EMAIL_NETWORK_TYPE_ARDUINO_MBED
#define DEFAULT_EMAIL_NETWORK_TYPE_MBED NETWORK_MBED_WIFI
#define DEFAULT_INTERNAL_ARDUINO_MBED_STORAGE STORAGE_NONE
#define DEFAULT_EXTERNAL_ARDUINO_MBED_STORAGE STORAGE_SD
#endif

`

Fix previous version erros

In the pull request of the previous version, there was an error, we are going to fix It.
Thanks for this forum topic https://mischianti.org/forums/topic/emailsender-not-compiling/ by Mark

Fix warnings

Fixed warning caused by the reuse of a constant.
#43 Thanks to @Patriboom @Andy2015

Add support for Ethernet_Generic and ESP8266SdFat library on Raspberry Pi Pico

Add support for Ethernet_Generic
Add the management of ESP8266SdFat library on Raspberry Pi Pico #forum

Add STM32, Raspberry pi Pico support and some fix

Fix external storage error 404 (#forum
Fix distribution list examples
Add Raspberry Pi Pico W and rp2040 boards
Add STM32 management for https://github.com/rogerclarkmelbourne/Arduino_STM32 library.

Add possibility to disable SSL via define

Add FORCE_DISABLE_SSL to disable SSL if present

Additional fix on additional response management

Additional fix on additional response management (#26)

Fixed attachment issue on SPIFFS and LittleFS

In this release we fix the attachment issue on SPIFFS and LittleFS

Manage response

Manage multiple response message after connect and HELO (#26)
Add possibility to set additionalResponseLineOnConnection with void setAdditionalResponseLineOnConnection(uint8_t numLines = 0), needed if on connection you receive 220 response as error, and add Ethernet2.

Change client context management for backward compatibility

Change client context management for backward compatibility, and change the example name.