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.

scenes/ui/rpg_world_host.tscn

@@ -0,0 +1,23 @@
+[gd_scene format=3]
+
+[ext_resource type="Script" path="res://mods/rpg/src/World/RpgWorldHost.cs" id="1_host"]
+
+[node name="RpgWorldHost" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+script = ExtResource("1_host")
+
+[node name="Backdrop" type="ColorRect" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+color = Color(0.06, 0.07, 0.09, 1)