move standalone projects into own directory

projects/_standalone/nat-flixel-desktop-playground/source/PlayState.hx

@@ -0,0 +1,33 @@
+package;
+
+import kiss.Prelude;
+import kiss.List;
+import sys.FileSystem;
+import nat.Entry;
+import nat.BoolExpInterp;
+import nat.Archive;
+import nat.ArchiveUI;
+import nat.ArchiveController;
+import flixel.addons.ui.FlxInputText;
+import flixel.addons.ui.FlxUIPopup;
+import flixel.text.FlxText;
+import flixel.util.FlxColor;
+using flixel.util.FlxSpriteUtil;
+import flixel.FlxCamera;
+import flixel.math.FlxRect;
+import flixel.addons.plugin.FlxMouseControl;
+import flixel.input.mouse.FlxMouseEventManager;
+using StringTools;
+using kiss_flixel.DebugLayer;
+using kiss_flixel.CameraTools;
+using kiss_flixel.SimpleWindow;
+import kiss_tools.KeyShortcutHandler;
+import kiss_tools.FlxKeyShortcutHandler;
+import nat.systems.PlaygroundSystem;
+import flash.desktop.Clipboard;
+import flash.desktop.ClipboardFormats;
+import haxe.ds.Option;
+import nat.components.Position;
+
+@:build(kiss.Kiss.build())
+class PlayState extends FlxState implements ArchiveUI {}