Made building consume resources

Now may build more than one if resources allow
building placement is red/green for indicating success

scripts/build_menu.gd

@@ -20,7 +20,7 @@ const BASIC_BUILDING_GROUP = preload("res://data/buildings/basic/basic_building_
 func _ready() -> void:
 	_add_building_group(BASIC_BUILDING_GROUP)
 	_add_building_group(ADVANCED_BUILDING_GROUP)
-	building_groups.set_focus()
+	#building_groups.set_focus()
 
 func _add_building_group(group: BuildingGroup) -> void:
 	building_groups.add_item(group.name, group.atlas_texture)
@@ -55,6 +55,8 @@ func _on_buildings_item_selected(index: int) -> void:
 		build_materials.add_child(image)
 		var label = Label.new()
 		label.text = str(selected_building.cost[res])
+		if not ResourceManager.has_amount(res, selected_building.cost[res]):
+			label.add_theme_color_override("font_color", Color.RED)
 		build_materials.add_child(label)
 	
 	description.show()