Revert "MonadLinear"

This reverts commit 77417ee45da8f9ee4e239b1f7e6a21013fd5b084.
Revert "Rename perform to unsafePerform"

This reverts commit 5577348b2520aca1c0f44bb30fbe74fd20a671db.
Revert "conduitSwapBase"

This reverts commit 90139e6c316de616e40f59918c761c52eac7e2cb.