Each object have their own state for animation. No more silly shared
state for all bombs
Assigning bombids is done by bomb and not world
Some cleanup. World now only tracks actors. Not players and bombs and
whatnot
Generalize world more. Adds explosions for bombs
Adds explosions. They are only graphics, but looks "pretty" :)
Make explosions lethal. However, player does not know how to die yet

Some logic from lethal flames action should be refactored to somewhere
else, as some of the copy is more or less duplicated elsewhere.. but im
having too much fun - i want to see actors die soon :)
Actor should die of its own flames
Make players killable - and let them respawn again
Added "use strict" for browser js files