Added some functionality for plugins that want to render in other editing modes

Source/Core/Editing/ClassicMode.cs

@@ -102,6 +102,9 @@ namespace CodeImp.DoomBuilder.Editing
 		// Panning
 		public bool IsPanning { get { return panning; } }
 
+		// Rendering
+		public IRenderer2D Renderer { get { return renderer; } }
+
 		#endregion
 
 		#region ================== Constructor / Disposer

Source/Core/Plugins/Plug.cs

@@ -322,6 +322,7 @@ namespace CodeImp.DoomBuilder.Plugins
 		// Rendering events
 		public virtual void OnEditRedrawDisplayBegin() { }
 		public virtual void OnEditRedrawDisplayEnd() { }
+		public virtual void OnPresentDisplayBegin() { }
 		
 		#endregion
 	}

Source/Core/Plugins/PluginManager.cs

@@ -300,6 +300,7 @@ namespace CodeImp.DoomBuilder.Plugins
 		public void OnEditMouseInput(Vector2D delta) { foreach(Plugin p in plugins) p.Plug.OnEditMouseInput(delta); }
 		public void OnEditRedrawDisplayBegin() { foreach(Plugin p in plugins) p.Plug.OnEditRedrawDisplayBegin(); }
 		public void OnEditRedrawDisplayEnd() { foreach(Plugin p in plugins) p.Plug.OnEditRedrawDisplayEnd(); }
+		public void OnPresentDisplayBegin() { foreach(Plugin p in plugins) p.Plug.OnPresentDisplayBegin(); }
 		
 		#endregion
 	}

Source/Core/Rendering/Renderer2D.cs

@@ -202,6 +202,8 @@ namespace CodeImp.DoomBuilder.Rendering
 		// This draws the image on screen
 		public void Present()
 		{
+			General.Plugins.OnPresentDisplayBegin();
+			
 			// Start drawing
 			if(graphics.StartRendering(true, General.Colors.Background.ToColorValue(), graphics.BackBuffer, graphics.DepthBuffer))
 			{

Source/Core/Rendering/Renderer3D.cs

@@ -767,6 +767,8 @@ namespace CodeImp.DoomBuilder.Rendering
 		// This finishes rendering
 		public void Finish()
 		{
+			General.Plugins.OnPresentDisplayBegin();
+
 			// Done
 			graphics.FinishRendering();
 			graphics.Present();

Source/Core/VisualModes/VisualMode.cs

@@ -86,6 +86,9 @@ namespace CodeImp.DoomBuilder.VisualModes
 		public bool ProcessGeometry { get { return processgeometry; } set { processgeometry = value; } }
 		public bool ProcessThings { get { return processthings; } set { processthings = value; } }
 		public VisualBlockMap BlockMap { get { return blockmap; } }
+
+		// Rendering
+		public IRenderer3D Renderer { get { return renderer; } }
 		
 		#endregion