Instead of decrementing all their counters every time an event occurs,
only the counters of the bindings being executed will be decremented.
`_LuaTemporariesDied` is a small optimization to prevent unnecessary calls
to `UpdateTemporaryBindings`. It will only be called when a temporary
binding has run out of shots and needs to be cleaned up.
This allows you to register a handler to only fire N times.
Dynamic event handler binding/unbinding is now possible.
For backwards compatibility, if the number of shots is missing, the event
handler will never be removed from the event.
