[orx-noise] Tidy up demos

Produce 720px wide images.
Use main() = application { for reduced indentation

orx-noise/src/jvmDemo/kotlin/glsl/DemoNoisesGLSLGui.kt

@@ -0,0 +1,38 @@
+package glsl
+
+import org.openrndr.application
+import org.openrndr.draw.colorBuffer
+import org.openrndr.extra.gui.GUI
+import org.openrndr.extra.noise.filters.*
+
+/**
+ * Render existing GLSL noise algorithms side by side.
+ * Use the GUI to explore the effects.
+ */
+fun main() = application {
+    configure {
+        configure {
+            width = 720
+            height = 360
+        }
+    }
+    program {
+        val noises = listOf(
+            HashNoise(), SpeckleNoise(), CellNoise(),
+            ValueNoise(), SimplexNoise3D(), WorleyNoise()
+        )
+
+        val img = colorBuffer((width - 200) / noises.size, 460)
+
+        val gui = GUI()
+        noises.forEach { gui.add(it) }
+        extend(gui)
+
+        extend {
+            noises.forEachIndexed { i, noise ->
+                noise.apply(emptyArray(), img)
+                drawer.image(img, 200.0 + i * img.width, 20.0)
+            }
+        }
+    }
+}