Change Seigniorage to to be Manual

Shill_Pill does a great job summarizing here.

essentially there will be a new tab in the dashboard that will let users see their "pending USD".

To actually receive it they need to burn a corresponding amount of SHARE.

Rationale: people hate seeing their tokens autoburned. This also makes our tokens composable into other DEFI blocks.

https://gov.dollarprotocol.com/t/changing-how-seigniorage-is-handled/99/5