[orx-chataigne] Add Chataigne support (#130)

orx-chataigne/src/demo/kotlin/ChataigneOSCDemo.kt

@@ -0,0 +1,29 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.osc.OSC
+
+fun main() = application {
+
+    configure {
+        width = 500
+        height = 500
+    }
+
+   /* Find the Chataigne example project in /resources */
+    class SceneVariables : ChataigneOSC(OSC(portIn = 9005, portOut = 12001)) {
+        val myRadius: Double by DoubleChannel("/myRadius")
+        val myOpacity: Double by DoubleChannel("/myOpacity")
+        val myColor: ColorRGBa by ColorChannel("/myColor")
+    }
+
+    program {
+        val animation = SceneVariables()
+
+        extend {
+            animation.update(seconds)
+
+            drawer.fill = animation.myColor.opacify(animation.myOpacity)
+            drawer.circle(width/2.0, height/2.0, animation.myRadius * 250)
+        }
+    }
+}