This commit makes it so players are always informed about their own
Pressure activations. This fixes Pressure PP tracking for players.
PP tracking for spectators will still be wrong; there's no fix for
that.
Fixes https://github.com/Zarel/Pokemon-Showdown-Client/issues/766
Rooms now have their logging abstracted into their own file, which also
allows the rest of rooms.js to be simplified by a decent margin.
This is in preparation for using Redis as a backing for scrollback log
storage, which will give us a lot more RAM to work with.
My newest newest plan is actually to locally cache room scrollback, and
only read battle logs from Redis. This will make chatroom-joining
faster.
