Fix checking connection is a player #539
Merged
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Removal of MultiKeyDict broke everything. This should help unbreak
things. Builds on @NotAFile's player_only decorator and discussion on
matrix.
Note that I've probably missed some cases - it's very pervasive.
Also need to check in each case that is updated that it actually makes
sense. In same cases we want to check the keys, not the values, because
we're looking for player_ids rather than connection objects.