Convert main static references off of Electron into interface implementation and expose the underlying Socket for low level interaction.

ElectronNET.API/NativeTheme.cs

@@ -2,13 +2,14 @@
 using System.Threading.Tasks;
 using ElectronNET.API.Entities;
 using ElectronNET.API.Extensions;
+using ElectronNET.API.Interfaces;
 
 namespace ElectronNET.API
 {
     /// <summary>
     /// Read and respond to changes in Chromium's native color theme.
     /// </summary>
-    public sealed class NativeTheme
+    public sealed class NativeTheme : INativeTheme
     {
         private static NativeTheme _nativeTheme;
         private static object _syncRoot = new object();