Added implementation of saving variables across reloads/logins
Move Debug/AnnounceExternal to persisted settings

Also removed hack to enable AnnounceExternal for me, since it'll now
persist if I just turn it on once!
Rename SlashCommand for testing

In preparation for adding main slash command for toggling non-test
options
Add the ability to toggle announcing in chat
Fix typos, and make the description more useful
Add option to toggle sounds
Add option to toggle TomTom waypoints