This proposal, if approved, will:

- Add USDT to Isolated mode
- Add USDC to Isolated mode
- Increase Isolated mode debt ceiling for PRIME to `4,000,000`

Currently, only HOLLAR can be borrowed against PRIME, up to a maximum amount of `2,222,222` HOLLAR - these changes will allow HOLLAR, USDT + USDC to be borrowed against PRIME, up to a maximum combined total of `4,000,000`.

The purpose of these changes are to allow PRIME looping to scale much more rapidly than with HOLLAR alone, whilst increasing the utilisation of USDT + C borrowing - benefitting HSM, H-Token pools as well as boosting yield for existing suppliers of raw USDT + C in Supply & Borrow.

#287 Add USDT/C to Isolated mode + increase debt ceiling to 4M