Chest Upgrades

[Champist]

How about making it so we can upgrade copper chests into silver chests, and silver chests into gold chests. Since as of now there isn't any use or value in copper or silver chests.

For example:
3x Elite Copper Warchest III --> 1x Elite Silver Warchest III
3x Elite Silver Warchest III --> 1x Elite Gold Warchest III

3x Elite Copper Pirate Chest II --> 1x Elite Silver Copper Pirate Chest II
3x Elite Silver Pirate Chest II --> 1x Elite Gold Pirate Chest II

3x Elite Copper Puzzlebox II --> 1x Elite Silver Puzzlebox II
3x Elite Silver Puzzlebox II --> 1x Elite Gold Puzzlebox II

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