[uievents] beforeInput should also be triggered when no "character value" is produced (#4)

The spec currently says that the beforeInput event is "only for keys which produce a character value" [1]. I spoke to @ojanvafai at the CSSWG meeting about this, and he said it was an error in that document, because they probably exchanged the "textinput" event with the "beforeinput" event and then left that text in there by mistake. 

The way we have decided to use the beforeInput event at the Editing Taskforce F2F is for it to be triggered at all user-initiated editor events, including undo/redo, bold/italics, delete, etc. . This means that the description "(only for keys which produce a character value)" should be removed.

See also https://github.com/w3c/editing/issues/87

[1] https://w3c.github.io/uievents/#h-events-keyboard-event-order

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