Migration to `rust-lightning` 0.0.113

[tnull]

We should do the following things after the upcoming release of rust-lightning 0.0.113:

• Use the BlockHash returned from get_relevant_txids to assert transactions are still confirmed in the correct block (see Track confirmation block hash and return via Confirm::get_relevant_txids rust-lightning#1796)
• Handle and forward the ChannelOpened event (see Add ChannelReady event rust-lightning#1743)
• Emit PaymentReceived on upstream PaymentClaimed after Rename PaymentReceived to PaymentClaimable rust-lightning#1891 has been merged.