This commit consists of these smaller commits:
Gateway: SessionID to be a method for thread safety
This commit breaks the SessionID field of the Gateway struct to
be thread-safe by wrapping its access with a read-write mutex.
As this is a bug fix, it is reasonable of a breaking change
Heart: Allow later binding of event channel
Voice: Use the new Heart API
Heart: Fixed data races
Heart: Allow changing pace, thread-safe Heartbeat
This commit refactored several structures from package discord to be in
package gateway. Those structures are mostly presence ones, which per
official documentation has a lot more to do with the Gateway API than
the REST API or anything else.
This commit also renamed several global variables to have a more
consistent and obvious name.
As of v8, the user API has had a lot of minor and some major changes,
especially regarding its Ready event API. The most significant change is
the addition of the ReadySupplemental event as well as several changes
to the Ready field itself.
All of these changes above are breaking, and they have already broken
the state package. These breaking changes will be addressed in other
packages by the next commit.