[orx-expression-evaluator] Switch to antlr-kotlin for parser generation and make it a common kotlin module

orx-expression-evaluator/src/jvmDemo/kotlin/DemoExpressionEvaluator02.kt

@@ -0,0 +1,45 @@
+import org.openrndr.application
+import org.openrndr.extra.expressions.evaluateExpression
+import org.openrndr.extra.expressions.watchingExpression1
+import org.openrndr.extra.gui.GUI
+import org.openrndr.extra.gui.addTo
+import org.openrndr.extra.parameters.TextParameter
+
+/**
+ * Improved version of DemoExpressionEvaluator01, it uses [watchingExpression1] to automatically convert an expression
+ * string into a function with a parameter "t".
+ */
+fun main() {
+    application {
+        program {
+            val gui = GUI()
+            gui.compartmentsCollapsedByDefault = false
+
+            // the constants used in our expressions
+            val constants = mutableMapOf("width" to drawer.width.toDouble(), "height" to drawer.height.toDouble())
+
+            val settings = object {
+                @TextParameter("x expression", order = 10)
+                var xExpression = "cos(t) * 50.0 + width / 2.0"
+
+                @TextParameter("y expression", order = 20)
+                var yExpression = "sin(t) * 50.0 + height / 2.0"
+
+                @TextParameter("radius expression", order = 30)
+                var radiusExpression = "cos(t) * 50.0 + 50.0"
+            }.addTo(gui)
+
+            val xFunction by watchingExpression1(settings::xExpression, "t", constants)
+            val yFunction by watchingExpression1(settings::yExpression, "t", constants)
+            val radiusFunction by watchingExpression1(settings::radiusExpression, "t", constants)
+
+            extend(gui)
+            extend {
+                val x = xFunction(seconds)
+                val y = yFunction(seconds)
+                val radius = radiusFunction(seconds)
+                drawer.circle(x, y, radius)
+            }
+        }
+    }
+}