[WIP] Lending: cross-collateral+ support

[jordaaash]

This PR will update support for all instructions in SPL token-lending, including

• https://github.com/solana-labs/solana-program-library/pull/1441
• https://github.com/solana-labs/solana-program-library/pull/1434
• https://github.com/solana-labs/solana-program-library/pull/1229

It incorporates and supersedes https://github.com/solana-labs/oyster-lending/pull/65

Todo

• [ ] https://github.com/solana-labs/oyster-lending/issues/5
• [ ] https://github.com/solana-labs/oyster-lending/issues/7
• [ ] https://github.com/solana-labs/oyster-lending/issues/8
• [ ] TBD

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[leofisG]

Is someone still working on this? Or this is stale?

[jordaaash]

@leonardgee Yep, I'm still working on this (last update looks older than it is because of the force push). This is to incorporate cross collateral/borrow and deposits/withdraws of collateral into Oyster Lending.