building system refactoring

audios/handleCoins2.ogg

audios/handleCoins2.ogg.import

objects/UI/inventory/build/build_container.gd

objects/UI/inventory/build/build_container.tscn

objects/UI/inventory/build/material_slot.gd

objects/UI/inventory/build/material_slot.tscn

objects/UI/inventory/build/structure_slot.gd

objects/UI/inventory/build/structure_slot.tscn

objects/UI/inventory/inventory/inventory_ui.gd

objects/UI/inventory/inventory/inventory_ui.tscn

objects/controller.tscn

objects/resources/gui_resources.tscn

objects/resources/item_scene/Apple.tscn

objects/resources/item_scene/AppleSeed.tscn

objects/resources/item_scene/Axe.tscn

objects/resources/item_scene/Boots.tscn

objects/resources/item_scene/Chestplate.tscn

objects/resources/item_scene/Headgear.tscn

objects/resources/item_scene/Wood.tscn

objects/resources/structure/test_struct.tres