Example and fix for non-main render target with SyphonServer

orx-syphon/src/test/kotlin/ServerExampleAlternateRenderTarget.kt

@@ -0,0 +1,34 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.isolatedWithTarget
+import org.openrndr.draw.renderTarget
+import kotlin.math.*
+
+
+fun main() = application {
+    configure {
+        width = 1000
+        height = 1000
+    }
+
+    program {
+        val rt = renderTarget(100, 100) {
+            colorBuffer()
+        }
+
+        extend(SyphonServer("Test", rt))
+
+        extend {
+            /**
+             * This is what will be sent to Syphon, and drawn in a small corner of the screen
+             */
+            drawer.isolatedWithTarget(rt) {
+                drawer.background(ColorRGBa(sin(seconds), cos(seconds / 2.0), 0.5, 1.0))
+            }
+
+            drawer.background(ColorRGBa.GRAY)
+            drawer.circle(width/2.0, height/2.0, sin(seconds) * width / 2.0)
+            drawer.image(rt.colorBuffer(0))
+        }
+    }
+}