make it shorter, simpler and more handy
deprecate this
```
EventTarget.addEventListener(...)
EventTarget.removeEventListener(...)
```
in pro of
```
EventTarget.on(...)
EventTarget.off(...)
```
make it easier, more intuitive and more readable
```
button.on(‘click’, e => ...)
form.on('submit', e => ...)
document.on('DOMContentLoaded', () => ...)
...
```
(and reduce code length)
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