[orx-parameters, orx-property-watchers, orx-file-watcher, orx-gui] Add @PathParameter, file watcher delegates and property delegates

orx-jvm/orx-gui/src/demo/kotlin/DemoPath01.kt

@@ -0,0 +1,28 @@
+import org.openrndr.application
+import org.openrndr.extra.gui.GUI
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.PathParameter
+import org.openrndr.extra.propertywatchers.watchingImagePath
+
+fun main() {
+    application {
+        program {
+            val gui = GUI()
+            gui.compartmentsCollapsedByDefault = false
+
+            val settings = @Description("Settings") object {
+                @PathParameter("image", extensions = ["jpg", "png"], order = 10)
+                var imagePath = "demo-data/image-001.png"
+
+                val image by watchingImagePath(::imagePath) {
+                    it
+                }
+            }
+            gui.add(settings)
+            extend(gui)
+            extend {
+                drawer.image(settings.image)
+            }
+        }
+    }
+}