Added support for G5.1 (quadratic spline) and multi turn arc option for G2 and G3 via P-word.

Some additions to data structures used by plugins.

plugins.h

@@ -88,6 +88,15 @@ typedef enum {
     WiFiMode_APSTA
 } grbl_wifi_mode_t;
 
+typedef struct {
+    bool is_ethernet;
+    bool link_up;
+    uint16_t mbps;
+    char mac[18];
+    grbl_wifi_mode_t wifi_mode;
+    network_settings_t status;
+} network_info_t;
+
 typedef struct {
     ssid_t ssid;
     password_t password;