implementing a clipboard chest with a maximum size #35
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This clipboard uses a linked list of names, so that I know which keys were added first and last.
This is also efficient in time to remove the first element of the list, which often happens when the clipboard is full (The key at first position is always the oldest key that was added and thus is always the key that is removed automatically when the clipboard is full).
I've arbitrarily set the default maximum size of a clipboard chest to 10 objects, but this can be changed