move standalone projects into own directory

projects/_standalone/nat-godot-playground/addons/haxe/scenes/tab.tscn

@@ -0,0 +1,35 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://addons/haxe/scripts/tab.gd" type="Script" id=1]
+
+[node name="Tab" type="Control"]
+margin_right = 40.0
+margin_bottom = 40.0
+rect_min_size = Vector2( 0, 200 )
+script = ExtResource( 1 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+anchor_right = 1.0
+anchor_bottom = 1.0
+rect_min_size = Vector2( 0, 200 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Button" type="Button" parent="VBoxContainer"]
+margin_right = 130.0
+margin_bottom = 20.0
+size_flags_horizontal = 0
+text = "Build Haxe Project"
+
+[node name="TextLog" type="TextEdit" parent="VBoxContainer"]
+margin_top = 24.0
+margin_right = 130.0
+margin_bottom = 200.0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+readonly = true
+context_menu_enabled = false