Hide all buttons when no drive in slot, prevents spamming of log when search buttons are clicked with nothing to search. Move search field to the left so as to be in line with the inventory slots and move page number to the right for a more viewable interface due to spacing.
Improves item registration and adds node registration. These functions allow easy registration of recipes, changing colour of second line in description, and "autocompletion" for texture names.
Previously the math was incorrect, allowing a single 8k drive to store over 300,000 items. This also cleans up the storage area a bit, moving the API related to storage drives from the main API.lua to storage/api.lua.
