Level 1 - Stability Mode Mint/Redeem Controls

In stability mode minting and redeeming rules are changed as follows:

1. aUSD minting is disabled

2. aUSD redemption fees are waived

3. xAVAX minting fees are waived

4. xAVAX redemption fees are increased

These controls are designed to ensure that user actions do not push the system CR further away from stability and that actions beneficial to the stability of the protocol are not charged any platform fee.