Zero fee like-token intra-Vesper transfers

[jgarzik]

Summary

Zero withdrawal fee, for pool-to-pool transfers within Vesper.

This proposal rests on top of , and depends on, proposal #32.

Specification

Do not charge a fee when moving tokens from one Vesper pool into another Vesper pool. e.g. Moving ETH from a conservative Grow pool to an ETH-DAI Earn pool. This may only be applied

• In cases where the withdraw token from the old pool (e.g. ETH) and the deposit token into the new pool (e.g. ETH, again) are the same.
• In cases where the withdraw pool and the deposit pool are both Vesper Grow or Earn pools. This does not apply to lending or other products.

[NinjaTurtle007]

This was long awaited and im glad to see it but WBTC conservative can be moved only to WBTC aggresive right now, and I would like to move it to the Earn WBTC pool since it has the best APY.