Event handler execution count for a handler defined for a behavior is shared among all installations of that behavior

If a behavior defines an event handler with a dispath count filter, then that filter will track the total number of dispatches across all installations of that behavior, rather than applying to each installation separately.

Example:
```hyperscript

behavior CounterToThree
on click 1 to 3 increment my textContent

0
0
```
Expected behavior: I expect to be able to click each button 3 times after which the two two buttons should display 3 3

Actual behavior: The 2 buttons can be clicked 3 times _in total_. That is, once they display either 3 0, 2 1, 1 2 or 0 3, neither button will respond to additional clicks.

Reproduziere das Problem mit dem gezeigten CounterToThree-Verhalten und zwei installierten Buttons und verfolge anschließend, wie der Event-Handler des Verhaltens den Dispatch-Count-Filter anwendet. Fertig ist es, wenn jeder Button unabhängig auf drei Klicks reagiert und 3 3 anzeigt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.