There's not many useful things we can do with this log, other than
providing a way for downstream applications to identify those logs.

Cargo will complain if the benchmarks that are defined in Cargo.toml are
not found, so we need to include the sources - even if the benchmark
itself cannot be run from the cargo package (due to the missing test
logs).

With a new release being on the way (and long overdue), it's time to get
the CHANGELOG up to date with what actually happened since v0.5.0.

There are two reasons for this:

First, we want to implement new events (and arcdps might add new events
themselves) without having to release a new major version. Adding enum
variants is usually a breaking change, because match blocks have to be
adjusted to keep every variant included. This is the same reason why we
made Encounter and Boss non-exhaustive as well.

Secondly, the usual modus operandi is not to iterate through all events
and do something for every event kind that you find, but rather to
iterate through the events and look for the events that you find
interesting. This means that most often, you will use a match with a
"do-nothing" catch-all, an if-let or a matches!() anyway, in which case
this change does not affect the code in a good or bad way.

It is way cheaper to retrieve the correct agent first (especially with
the faster agent_by_addr) and then check if it is a boss, rather than
iterating over all bosses (which iterates through all characters), and
then iterate through the found bosses to check if any address matches.

The new code is a bit longer (and doesn't combine the functions as
nicely), but it is still readable and more performant - which is more
important.