Demos: ensure all use fun main() = application {

- Adjust some demo window sizes.
- Replace Random.double by Double.uniform
- Tweak some demos so screenshots look more interesting

orx-fx/src/jvmDemo/kotlin/DemoBlend01.kt

@@ -1,29 +1,28 @@
 import org.openrndr.application
 import org.openrndr.extra.fx.blend.*
-fun main() {
-    application {
-        program {
-            val add = Add()
-            val colorBurn = ColorBurn()
-            val colorDodge = ColorDodge()
-            val darken = Darken()
-            val destIn = DestinationIn()
-            val destOut = DestinationOut()
-            val destAtop = DestinationAtop()
-            val hardLight = HardLight()
-            val lighten = Lighten()
-            val multiply = Multiply()
-            val multiplyContrast = MultiplyContrast()
-            val normal = Normal()
-            val overlay = Overlay()
-            val passthrough = Passthrough()
-            val screen = Screen()
-            val sourceIn = SourceIn()
-            val sourceAtop = SourceAtop()
-            val sourceOut = SourceOut()
-            val subtract = Subtract()
-            val xor = Xor()
-            application.exit()
-        }
+
+fun main() = application {
+    program {
+        val add = Add()
+        val colorBurn = ColorBurn()
+        val colorDodge = ColorDodge()
+        val darken = Darken()
+        val destIn = DestinationIn()
+        val destOut = DestinationOut()
+        val destAtop = DestinationAtop()
+        val hardLight = HardLight()
+        val lighten = Lighten()
+        val multiply = Multiply()
+        val multiplyContrast = MultiplyContrast()
+        val normal = Normal()
+        val overlay = Overlay()
+        val passthrough = Passthrough()
+        val screen = Screen()
+        val sourceIn = SourceIn()
+        val sourceAtop = SourceAtop()
+        val sourceOut = SourceOut()
+        val subtract = Subtract()
+        val xor = Xor()
+        application.exit()
     }
-}
+}