Denied WS requests' promises are now rejected
Draw grid bg. Make healthbar font color white.
Add healthbars to creatures.

As a result some drawing routines executed for actors in game.js were
injected into hero.js code which is right. As a slight degradation pseudo
walking animation was disabled.
Reload page on starting game exceptions.
Set attack sfx volume down
Save muted volume state to client local storage
Handle multiple logins for same account.

Which resulted in adding PermaStorage#UpdateUser method which also
persists user position between sessions.