Fixed several issues

* Increased bones inventory to accommodate full player main inventory and full player crafting grid, preventing lost items
* Altered bones formspec to accommodate this change
* Fixed error where bones would replace half a door, but the other half would remain in place
* Fixed issue where owned objects (locked chests and steel doors) could be removed by bones
* Added node drops for replaced node (excluding nodes that are buildable_to) to bones inventory, preventing lost nodes