Improve demos for better screenshots, cleanup

orx-gui/src/demo/kotlin/DemoXYParameter.kt

@@ -1,4 +1,5 @@
 import org.openrndr.application
+import org.openrndr.extensions.SingleScreenshot
 import org.openrndr.extra.gui.GUI
 import org.openrndr.extra.parameters.Description
 import org.openrndr.extra.parameters.XYParameter
@@ -11,7 +12,15 @@ fun main() = application {
     }
 
     program {
+        // -- this block is for automation purposes only
+        if (System.getProperty("takeScreenshot") == "true") {
+            extend(SingleScreenshot()) {
+                this.outputFile = System.getProperty("screenshotPath")
+            }
+        }
+
         val gui = GUI()
+        gui.compartmentsCollapsedByDefault = false
 
         val settings = @Description("Settings") object {
             @XYParameter("Position", 0.0, 800.0, 0.0, 800.0,