Started buildings undo system implementation

godot/main/editor.tscn

@@ -110,7 +110,7 @@ text = "NPC Mode"
 unique_name_in_owner = true
 margin_top = 154.0
 margin_right = 160.0
-margin_bottom = 224.0
+margin_bottom = 248.0
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer/v_buildings"]
 margin_right = 160.0
@@ -138,11 +138,18 @@ margin_right = 160.0
 margin_bottom = 70.0
 text = "Building Type"
 
+[node name="buildings_save" type="Button" parent="VBoxContainer/v_buildings"]
+unique_name_in_owner = true
+margin_top = 74.0
+margin_right = 160.0
+margin_bottom = 94.0
+text = "Save Buildings"
+
 [node name="v_navigation" type="VBoxContainer" parent="VBoxContainer"]
 unique_name_in_owner = true
-margin_top = 228.0
+margin_top = 252.0
 margin_right = 160.0
-margin_bottom = 250.0
+margin_bottom = 274.0
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer/v_navigation"]
 margin_right = 160.0
@@ -156,9 +163,9 @@ text = "Navigation mode"
 
 [node name="v_poi" type="VBoxContainer" parent="VBoxContainer"]
 unique_name_in_owner = true
-margin_top = 254.0
+margin_top = 278.0
 margin_right = 160.0
-margin_bottom = 276.0
+margin_bottom = 300.0
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer/v_poi"]
 margin_right = 160.0
@@ -172,9 +179,9 @@ text = "POI mode"
 
 [node name="v_road_lines" type="VBoxContainer" parent="VBoxContainer"]
 unique_name_in_owner = true
-margin_top = 280.0
+margin_top = 304.0
 margin_right = 160.0
-margin_bottom = 302.0
+margin_bottom = 326.0
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer/v_road_lines"]
 margin_right = 160.0
@@ -188,9 +195,9 @@ text = "Road Lines mode"
 
 [node name="v_npc" type="VBoxContainer" parent="VBoxContainer"]
 unique_name_in_owner = true
-margin_top = 306.0
+margin_top = 330.0
 margin_right = 160.0
-margin_bottom = 328.0
+margin_bottom = 352.0
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer/v_npc"]
 margin_right = 160.0