Refactor MLIL instructions

* Turn `MediumLevelILInstruction` into a struct with a `kind` field to
indicate the instruction variant, and pull out the `function` and
`address` fields from each variant to live in the top-level struct.
* Make variant fields public, remove field getter methods and centralize
  lifting logic to happen all at once. Split tuple fields into
  individual named fields.
* Move the `operands` method to `MediumLevelILLiftedInstruction`, and
  make it return an owned `Vec` of operands rather than a borrowed
  iterator.

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