[orx-noise] Tidy up demos

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

orx-noise/src/jvmDemo/kotlin/hash/DemoRectangleHash01.kt

@@ -0,0 +1,27 @@
+package hash
+
+import org.openrndr.application
+import org.openrndr.extra.noise.shapes.hash
+import org.openrndr.extra.noise.shapes.uniform
+import kotlin.random.Random
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 540
+    }
+    program {
+        extend {
+            val b = drawer.bounds
+            val b0 = b.sub(0.0, 0.0, 0.5, 1.0).offsetEdges(-10.0)
+            val b1 = b.sub(0.5, 0.0, 1.0, 1.0).offsetEdges(-10.0)
+
+            val r = Random(0)
+            for (i in 0 until 20000) {
+                drawer.circle(b0.uniform(r), 2.0)
+                drawer.circle(b1.hash(909, i), 2.0)
+
+            }
+        }
+    }
+}