Add extra hashtags for bingo and game completion messages

[theastropath]

Probably just on Mastodon, since we have more characters to play with, but it might be good to tag the different types of messages

DXRandoDeaths - For deaths (obviously)

DXRandoBingo - For bingo line messages (with the bingo board)

DXRandoActivities - For random things around the world (eg. Using Jock's toilet)

DXRandoCompletion - For game completions

A game completion should probably include both DXRandoBingo and DXRandoCompletion

This could let us add "featured hashtags" on the Mastodon account

[theastropath]

I also wonder if we should remove the #DeusEx from Mastodon toots, as it's more plausible over there to actually follow the hashtag and we really flood it at the moment