Void Storage - Inventory Solution for Vanilla 1.13

To setup objectives, run once:
/function void_storage:init_scores

Run after init_scores, and again whenever a new player joins
/function void_storage:init_players

3 command blocks: repeat, unconditional, always active:
execute as @a[scores={vsdeposit=1..}] run function void_storage:deposit
execute as @a[scores={vswithdraw=1..}] run function void_storage:withdraw
execute as @a[scores={vsgetbook=1..}] run function void_storage:get_book

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