Pre-creates threads for all worlds in threaded Discord output channels on watcher module start. Threads are created in reverse world name order, as thread subscriptions are listed in the Discord client in most recent (top) -> least recent (bottom) order. Also pre-warms the cache for Discord text channels and threads.
Resolves #91 (closed) (rapid creation of new threads duplicated some world's hint threads).
Also fixes a bug related to thread creation / presence, and an additional command output bug:
- Resolves #94 (closed): large
!remainingoutput fails to send - Resolves #92 (closed): thread auto-archive time was not at maximum