[w3c/editing] [beforeinput] Rename drag&drop to deleteByDrag&insertFromDrop (#147)

We should use the name `deleteByDrag`&`insertFromDrop` to make it clear that the event is only for DOM modification. (e.g. Preventing `deleteByDrag` won't stop the `drag&drop` process)

**Background:**
Assume we all agree that `InputEvent` should only focus on DOM modification https://github.com/w3c/editing/issues/144#issuecomment-240892363, and we are renaming `cut`&`paste` to `deleteByCut`&`insertFromPaste`.

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