move standalone projects into own directory

projects/_standalone/flixel-desktop-habit-puzzle-game/source/jigsawx/math/Vec2.hx

@@ -0,0 +1,25 @@
+package jigsawx.math;
+class Vec2{
+    public var x: Float;
+    public var y: Float;
+    public function new( x_ = .0, y_ = .0 ){
+        x = x_;
+        y = y_;
+    }
+    public function copy() {
+        return new Vec2(x, y);
+    }
+    public function add(dx:Float, dy:Float) {
+        x += dx;
+        y += dy;
+        return this;
+    }
+    public function subtract(dx:Float, dy:Float) {
+        x -= dx;
+        y -= dy;
+        return this;
+    }
+    public function toString() {
+        return '(${x}, ${y})';
+    }
+}