Marked all service implementations as internal

Core - Enabled XML docs
Modules - Added DI to module VMs

src/Artemis.Core/Plugins/Modules/ModuleTab.cs

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+using System;
+using Artemis.Core.Plugins.Abstract;
+using Artemis.Core.Plugins.Abstract.ViewModels;
+
+namespace Artemis.Core.Plugins.Modules
+{
+    /// <inheritdoc />
+    public class ModuleTab<T> : ModuleTab where T : ModuleViewModel
+    {
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="ModuleTab{T}" /> class
+        /// </summary>
+        /// <param name="title">The title of the tab</param>
+        public ModuleTab(string title)
+        {
+            Title = title;
+        }
+
+        /// <inheritdoc />
+        public override Type Type => typeof(T);
+    }
+
+    /// <summary>
+    ///     Describes a UI tab for a specific module
+    /// </summary>
+    public abstract class ModuleTab
+    {
+        /// <summary>
+        ///     The module this tab belongs to
+        /// </summary>
+        internal Module Module { get; set; }
+
+        /// <summary>
+        ///     The title of the tab
+        /// </summary>
+        public string Title { get; protected set; }
+
+        /// <summary>
+        ///     The type of view model the tab contains
+        /// </summary>
+        public abstract Type Type { get; }
+    }
+}

src/Artemis.Core/Plugins/Modules/ProcessActivationRequirement.cs

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+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using Artemis.Core.Extensions;
+
+namespace Artemis.Core.Plugins.Modules
+{
+    public class ProcessActivationRequirement : IModuleActivationRequirement
+    {
+        public string ProcessName { get; set; }
+        public string Location { get; set; }
+
+        public ProcessActivationRequirement(string processName, string location = null)
+        {
+            ProcessName = processName;
+            Location = location;
+        }
+
+
+        public bool Evaluate()
+        {
+            if (ProcessName == null && Location == null)
+                return false;
+
+            var processes = ProcessName != null ? Process.GetProcessesByName(ProcessName).Where(p => !p.HasExited) : Process.GetProcesses().Where(p => !p.HasExited);
+            return Location != null 
+                ? processes.Any(p => Path.GetDirectoryName(p.GetProcessFilename()) == Location)
+                : processes.Any();
+        }
+    }
+
+    public interface IModuleActivationRequirement
+    {
+        bool Evaluate();
+    }
+}