Errata from:
* 8ce5da30260c1368ae97838fcf010375071a7243
* 5d3144e8fb5c7202991b7614d77dfc00903fcb2e
which missed a few numbers.
[skip sauce]
[skip validator]
When a DOM node is passed to an HTML tooltip, the `title` node is only
moved if it is not already in the tooltip. Otherwise, `empty()` is used
instead of `detach()` before appending the `title` to avoid memory
leaks. If a DOM node is passed to a plain text tooltip, its text is
copied via jQuery `.text()`.
Replaces `.detach()` with `.empty()`, as `.detach()` is almost never
useful but instead leaks memory. The difference between `empty` and
`detach` is that the latter keeps all the attached jQuery events/data.
However, since we do not return the previous children, the user would
have to keep these themselves, thus they can `detach()` if necessary.
This is a port of https://github.com/twbs/bootstrap/pull/14552 to v4.
