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-fcurve/src/jvmDemo/kotlin/DemoFCurve01.kt

@@ -1,19 +1,17 @@
 import org.openrndr.application
 import org.openrndr.extra.fcurve.fcurve
 
-fun main() {
-    application {
-        configure {
-            width = 720
-            height = 720
-        }
-        program {
-            val xpos = fcurve("M0 Q4,360,5,720").sampler()
-            val ypos = fcurve("M360 h5").sampler()
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        val xpos = fcurve("M0 Q4,360,5,720").sampler()
+        val ypos = fcurve("M360 h5").sampler()
 
-            extend {
-                drawer.circle(xpos(seconds.mod(5.0)), ypos(seconds.mod(5.0)), 100.0)
-            }
+        extend {
+            drawer.circle(xpos(seconds.mod(5.0)), ypos(seconds.mod(5.0)), 100.0)
         }
     }
-}
+}