added very simple GPS GUI

src/bin/pathfinder/PFClient.hx

@@ -0,0 +1,54 @@
+package bin.pathfinder;
+
+import lib.Pos3;
+import lib.ui.elements.UIElement;
+import lib.ui.elements.TextElement;
+import lib.ui.elements.RootElement;
+import kernel.ui.WindowContext;
+import kernel.ps.ProcessHandle;
+import kernel.ps.Process;
+
+class PFClient implements Process {
+    private var handle:ProcessHandle;
+
+    private var ctx: WindowContext;
+    private var requestRender:Void -> Void;
+    private var root:RootElement;
+
+    public function new() {}
+
+	public function run(handle:ProcessHandle) {
+        this.handle = handle;
+
+        var stateless = handle.createStatelessWindowContext();
+        this.ctx = stateless.ctx;
+        this.requestRender = stateless.requestRender;
+
+        stateless.setRenderFunc(this.render);
+
+        this.root = new RootElement();
+        this.root.setTitle("Pathfinder");
+
+        this.ctx.delegateEvents(this.root);
+
+        this.requestRender();
+    }
+
+    private function render() {
+        var acc = kernel.gps.GPS.instance.getAccuracy();
+        var pos: Pos3 = kernel.gps.GPS.instance.getPosition() ?? {x: 0, y: 0, z: 0};
+
+        var childre: Array<UIElement> = [
+            new TextElement('Acc: ${acc}'),
+            new TextElement('Pos: X:${pos.x} Y:${pos.y} Z:${pos.z}'),
+            new TextElement('UPDATE', { onClick: () -> {
+                kernel.gps.GPS.instance.locate().handle((pos) ->{
+                    this.requestRender();
+                });
+            }}),
+        ];
+
+        this.root.setChildren(childre);
+        this.root.render(ctx.getSize()).renderToContext(ctx);
+    }
+}