Re: [w3c/editing] beforeInput: Unify "deleteContent" and "deleteComposedCharacter" (#118)

Just to clarify UA should only fire `deleteComposedCharacter` during composition, but not for the deletion of final 'ComposedCharacter' after composition?

For example in Chinese IME:
1. Press 'n', (fire `insertText` with data='n')
2. Press 'u', (fire `insertText` with data='u')
3. Press 'backspace', (**fire `deleteComposedCharacter`** because it's still during composition)
4. Press 'i', (fire `insertText` with data='i')
5. Press 'space' to accept, (fire `insertText`|`replaceContent` with data='你')
6. Press 'backspace', (**fire `deleteContent`** because it's outside composition even if the character to be deleted is a composed character)

And also @johanneswilm do you mind pointing me to the discussion in F2F? I agree with @yosinch that having both is redundant since we already have [`isComposing`](https://w3c.github.io/uievents/#dom-inputevent-iscomposing)

Thanks!

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