Merge pull request #2387 from vladimirfomene/add_extra_fields_to_ChannelClosed_event

Add counterparty_node_id & channel_capacity to ChannelClosed event

diff --cc lightning/src/events/mod.rs
Simple merge

diff --cc lightning/src/ln/channelmanager.rs
Simple merge

diff --cc lightning/src/ln/functional_test_utils.rs
Simple merge

diff --cc lightning/src/ln/functional_tests.rs
Simple merge

diff --cc lightning/src/ln/payment_tests.rs
Simple merge