Implemented IPC system with minimal testing.

Large naming refactoring.

Added some more tests.

tests/GameServiceWarden.Core.Tests/UI/IPCMediatorTest.cs

@@ -0,0 +1,47 @@
+using System;
+using GameServiceWarden.Core.UI;
+using Xunit;
+
+namespace GameServiceWarden.Core.Tests.UI
+{
+    public class IPCMediatorTest
+    {
+        [Fact]
+        public void Open_Closed_Opened()
+        {
+            //Given
+            const string NAME = "MEDIATOR";
+            IPCMediator mediator = new IPCMediator(NAME);
+            //When
+            mediator.Open();
+            //Then
+            Assert.True(mediator.IsRunning);
+        }
+
+        [Fact]
+        public void Open_AlreadyOpened_Exception()
+        {
+            //Given
+            const string NAME = "MEDIATOR";
+            IPCMediator mediator = new IPCMediator(NAME);
+            //When
+            mediator.Open();
+            //Then
+            Assert.Throws<InvalidOperationException>(() => mediator.Open());
+        }
+
+        [Fact]
+        public void Close_Opened_Closed()
+        {
+            //Given
+            const string NAME = "MEDIATOR";
+            IPCMediator mediator = new IPCMediator(NAME);
+            //When
+            mediator.Open();
+            //Then
+            Assert.True(mediator.IsRunning);
+            mediator.Close();
+            Assert.False(mediator.IsRunning);
+        }
+    }
+}