[orx-gui] doubleBind default true, add side canvas, add defaultStyles argument

orx-jvm/orx-gui/src/demo/kotlin/DemoSideCanvas01.kt

@@ -0,0 +1,48 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.gui.GUI
+import org.openrndr.extra.parameters.*
+import org.openrndr.math.Vector2
+import org.openrndr.panel.elements.draw
+
+
+/**
+ * A simple demonstration of a GUI for drawing some circles
+ */
+fun main() = application {
+    configure {
+        width = 800
+        height = 800
+        windowResizable = true
+
+    }
+    program {
+        val gui = GUI(baseColor = ColorRGBa.GRAY.shade(0.25))
+        gui.compartmentsCollapsedByDefault = false
+        gui.enableSideCanvas = true
+
+
+        val settings = @Description("Settings") object {
+            @DoubleParameter("radius", 0.0, 100.0)
+            var radius = 50.0
+
+            @Vector2Parameter("position", 0.0, 1.0)
+            var position = Vector2(0.6, 0.5)
+
+            @ColorParameter("color")
+            var color = ColorRGBa.PINK
+
+            @DoubleListParameter("radii", 5.0, 30.0)
+            var radii = mutableListOf(5.0, 6.0, 8.0, 14.0, 20.0, 30.0)
+        }
+        gui.add(settings)
+        extend(gui)
+
+        gui.canvas?.draw {
+            val width = drawer.width
+            val height = drawer.height
+            drawer.fill = settings.color
+            drawer.circle(width/2.0, height/2.0, 100.0)
+        }
+    }
+}