Feature label styling (#454)

* Added some basic tests for the ECS

* Add test project for Nuclex Gui

* Nuclex Gui project update

* Added ability to style labels

* Removed Nuclex Gui Test project for lack of tests

Source/Tests/MonoGame.Extended.Entities.Tests/Implementation/EntityComponentBasic.cs

@@ -0,0 +1,10 @@
+using MonoGame.Extended.Entities;
+
+namespace MonoGame.Extended.Gui.Tests.Implementation
+{
+    [EntityComponent]
+    public class EntityComponentBasic : TransformComponent2D
+    {
+        public int Number { get; set; }
+    }
+}

Source/Tests/MonoGame.Extended.Entities.Tests/Implementation/EntityTemplateBasic.cs

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+using MonoGame.Extended.Entities;
+
+namespace MonoGame.Extended.Gui.Tests.Implementation
+{
+    [EntityTemplate(Name)]
+    public class EntityTemplateBasic : EntityTemplate
+    {
+        public const string Name = nameof(EntityTemplateBasic);
+
+        protected override void Build(Entity entity)
+        {
+            entity.Attach<EntityComponentBasic>();
+        }
+    }
+}

Source/Tests/MonoGame.Extended.Entities.Tests/Implementation/EntityTemplateUsingManager.cs

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+using MonoGame.Extended.Entities;
+
+namespace MonoGame.Extended.Gui.Tests.Implementation
+{
+    [EntityTemplate(Name)]
+    public class EntityTemplateUsingManager : EntityTemplate
+    {
+        public const string Name = nameof(EntityTemplateUsingManager);
+
+        protected override void Build(Entity entity)
+        {
+            var num = Manager.EntityManager.TotalEntitiesCount;
+            entity.Attach<EntityComponentBasic>(c => c.Number = num);
+        }
+    }
+}

Source/Tests/MonoGame.Extended.Entities.Tests/Implementation/README.md

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+
+# Implementation
+
+This folder is for making a testable implementation using the ECS library.
+This implementation is used in the unit tests in this project.