Add a simplified version of input remapping

gui/input_mapping/ActionRemapButton.tscn

@@ -0,0 +1,12 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://ActionRemapButton.gd" type="Script" id=1]
+
+[node name="ActionRemapButton" type="Button"]
+margin_right = 90.0
+margin_bottom = 30.0
+toggle_mode = true
+script = ExtResource( 1 )
+__meta__ = {
+"_edit_use_anchors_": false
+}