Add Network (NIC) support (updated) (#52)

* [Core] Add Network (NIC) support - All credits to XiaofengdiZhu (https://github.com/XiaofengdiZhu/openhardwaremonitor/commits/EditeByXiaofengdizhu)

* [Core] NIC: Rename InternetSpeed to Throughput, drop non physical devices (like loopback), fix alltime stats for adapter

GUI/MainForm.cs

@@ -58,6 +58,7 @@ namespace OpenHardwareMonitor.GUI {
     private UserOption readGpuSensors;
     private UserOption readFanControllersSensors;
     private UserOption readHddSensors;
+    private UserOption readNicSensors;
 
     private UserOption showGadget;
     private UserRadioGroup plotLocation;
@@ -266,6 +267,12 @@ namespace OpenHardwareMonitor.GUI {
         computer.HDDEnabled = readHddSensors.Value;
       };
 
+      readNicSensors = new UserOption("nicMenuItem", true, nicMenuItem,
+        settings);
+      readNicSensors.Changed += delegate(object sender, EventArgs e) {
+        computer.NICEnabled = readNicSensors.Value;
+      };
+
       showGadget = new UserOption("gadgetMenuItem", false, gadgetMenuItem,
         settings);
       showGadget.Changed += delegate(object sender, EventArgs e) {