Add resource and image class (non functional) and add update function to abstract class Renderer

engine/source/core/engine.d

@@ -38,7 +38,7 @@ class Engine {
 	}
 
 	void runNodePhysicsProcesses() {
-		// Schade!
+		// Schade! Have the wrong function content while I figure out how std.datetime.watch works
 		const float current = watch.peek.total!"msecs" / 1_000;
 		float delta = (current - previousProcessTick);
 

engine/source/renderer/renderer.d

@@ -11,6 +11,9 @@ abstract class Renderer {
 	void preDraw();
 	void postDraw();
 
+	// Update
+	void update();
+
 	// Util
 	void setWindowTitle(string title);
 }

engine/source/resources/image.d

@@ -0,0 +1,5 @@
+module gameengine.resources.image;
+
+import gameengine.resources.resource;
+
+abstract class Image : Resource {}

engine/source/resources/resource.d

@@ -0,0 +1,3 @@
+module gameengine.resources.resource;
+
+abstract class Resource {}