Added image UI element.

include/dawn/ui/image.h

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "../libs.h"
+#include "../display/primitive.h"
+
+typedef struct {
+  float x, y;
+  texture_t *texture;
+  primitive_t quad;
+  float u0, v0;
+  float u1, v1;
+} image_t;