Merge pull request #2863 from benthecarman/breakup-coop-close

Breakup CooperativeClosure into Local/Remote initiated

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

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

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

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

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