Admin fees burning update

Summary:

Update burners for 3crv to mitigate slippage losses and aleth, peth and crv dedicated coins to avoid borked pools.

Abstract:

Currently outdated burner for 3crv is being used without slippage protection.
Other named coins use hacked pools to convert.

Motivation:

High(w.r.t. 3pool size) DAO profit volumes are vulnerable to sandwich attacks.
Using hacked pools for coins named above can result in loss of funds.

Specification:

3pool coins (USDC, USDT, DAI) → Deposit Burner allows 0.5% loss from slippage. Parameter is controlled by the DAO.
alETH, pETH, CRV/ETH LP and CRV → 0x0…000 until further changes, one is already up for discussion

For:
Saves admin fees from slippage and losing them in borked pools.

Against:
Nothing I can think of

Poll:
https://dao.curve.fi/vote/ownership/390

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