[orx-composition, orx-svg] Move Composition and SVG code from OPENRNDR to ORX

orx-composition/src/commonTest/kotlin/TestComposition.kt

@@ -0,0 +1,38 @@
+package org.openrndr.extra.composition
+
+import org.openrndr.shape.Shape
+import kotlin.test.*
+
+class TestComposition {
+    val composition = let { _ ->
+        val root = GroupNode().also { it.id = "outer" }
+        root.children += GroupNode().also {
+            it.id = "inner"
+        }
+        root.children += ShapeNode(Shape.EMPTY).also {
+            it.id = "shape"
+        }
+        Composition(root)
+    }
+
+    @Test
+    fun findGroup() {
+        assertEquals("outer", composition.findGroup("outer")?.id)
+        assertEquals("inner", composition.findGroup("inner")?.id)
+        assertNull(composition.findGroup("shape"))
+    }
+
+    @Test
+    fun findShape() {
+        assertEquals("shape", composition.findShape("shape")?.id)
+        assertNull(composition.findShape("inner"))
+        assertNull(composition.findShape("outer"))
+    }
+
+    @Test
+    fun findImage() {
+        assertNull(composition.findImage("inner"))
+        assertNull(composition.findImage("outer"))
+        assertNull(composition.findImage("shape"))
+    }
+}