Allow Users to swap & deposit assets directly from UI

[divine-comedian]

This feature would allow users when depositing/donating and withdrawing to instantly swap assets within the same GIVsavings UX

The flow could be like this

• Depositing: User can see a list of eligible tokens on the drop down menu, they can deposit this token directly into a GIVsavings account. The token is auto-converted into the right asset and deposited into the account

• Withdrawing: User can see a list of eligible tokens on the drop down menu, they can withdraw from their vault and receive the selected token instead of the base asset. The base asset is withdraw, auto-converted and sent to the withdrawer

We'll need to do more research on this feature. Currently Yearn has developed their own version of it but it is error prone and limited in assets eligible.

Here's a demo of how it works on the yearn side:

YearnZap.mp4

This feature may be too complex and we might need to make it a post MVP addition