RPG world mod: tile maps, grid walking, map events, battles

Maps of square tiles in three layers plus a collision layer, mounted over
the 2D shell when their scene is entered. WASD walking, E/F action events,
touch teleports, story-flag conditions, random encounters, rpg.battle and
rpg.teleport actions, position saving. Integration suite rpg_walk.

patches/scenes/ui/base_scene.tscn

@@ -0,0 +1,8 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="PackedScene" path="res://mods/shell2d_base/scenes/ui/base_scene.tscn" id="1_target"]
+[ext_resource type="PackedScene" path="res://scenes/ui/rpg_world_host.tscn" id="2_world"]
+
+[node name="BaseScene" instance=ExtResource("1_target")]
+
+[node name="RpgWorldHost" parent="Scene" index="2" instance=ExtResource("2_world")]