* Change vault supply to shares
* Update deposit shares
* Use shares instead of supplied
* Update tests, fix share calculation
* Pass hard and savings keeper as pointer to earn keeper
* Update remaining failing test
* Add different share price test, fix comment for share price
* Add shares amount to events
* Additional share tests, use share to asset conversion for withdraw amount
* Update VaultTotalValue test
* Use sdk.Dec for vault shares instead of sdk.Int
* Add test for expensive 20:1 shares
* Update ConvertToShares comment for division, remove redundant test
* Add vault share tests
