Add PSK support for WiFiMulti

[xchgrbprsp]

I need to use a PSK instead of a passphrase to connect to WiFi networks using the WiFiMulti library. However, I noticed in the code that there's a length limit of 63 for the argument passphrase.

WiFiMulti.cpp:

bool WiFiMulti::addAP(const char* ssid, const char *passphrase)
{
    WifiAPlist_t newAP;

    if(!ssid || *ssid == 0x00 || strlen(ssid) > 31) {
        // fail SSID too long or missing!
        log_e("[WIFI][APlistAdd] no ssid or ssid too long");
        return false;
    }

    if(passphrase && strlen(passphrase) > 63) {
        // fail passphrase too long!
        log_e("[WIFI][APlistAdd] passphrase too long");
        return false;
    }

and unsurprisingly I got the following error when I call addAP with a PSK which is 64 bytes long:
[E][WiFiMulti.cpp:61] addAP(): [WIFI][APlistAdd] passphrase too long

The thing is WiFi.begin takes PSK as the passphrase argument just fine and I was able to successfully connect when I changed the passphrase length limit to 64 instead.

[I][WiFiMulti.cpp:84] addAP(): [WIFI][APlistAdd] add SSID: XXXXXX
[I][WiFiMulti.cpp:119] run(): [WIFI] 14 networks found
[I][WiFiMulti.cpp:160] run(): [WIFI] Connecting BSSID: A8:E5:44:XX:XX:XX SSID: XXXXXX Channal: 7 (-46)
[I][WiFiMulti.cpp:174] run(): [WIFI] Connecting done.

I would like to know if this is a bug where the passphrase argument length limit was not revised when PSK support was added or if there are other concerns for allowing PSK here. Thanks.

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