UMIP 77 -Add yUSD, RAI, COMP, YFI, ALCX, ALPHA, MKR, CRV, REN, RGT, and NFTX as approved collateral currencies

This UMIP will add yUSD, COMP, YFI, ALCX, ALPHA, MKR, CRV, REN, RGT, and NFTX as approved collateral currencies. This will involve adding each of these tokens to the whitelist and adding flat final fees to charge per-request.