generic wifi access point support added

[ombra32]

WiFi access point mode was missing in current release (station mode only supported)
I've added it in the generic wifi.h file, so it can be used with many modules

before including RemoteXY repository, the remaining ecosystem must be added
for example:

#include <SPI.h>      // SPI standard library
#include <WiFiNINA.h> // WiFiNINA module library v1.8.7

#define REMOTEXY_MODE__WIFI_POINT // data transfer using wifi.h library and open server with access point
#define REMOTEXY__DEBUGLOGS Serial
#include <RemoteXY.h> // RemoteXY library v2.4.6 (modified)

I've tested it on Arduino Nano 33 IoT with WiFiNINA module