Since we're already using jquery-ui for other stuff, it makes sense to use it
for tooltips too, instead of using an old-school-written-in-2009 1300 lines
steaming pile of javascript named wz_tooltip.js
Since the `border: 0;` property is applied
to every checkbox, there is no need for a class.
This is also a good opportunity to use ternaries
for the `checked` attribute, instead of clumsy `if`.
The inline javascript used with the cancel buttons
was only used to change the location.
Instead of doing this, it's easier to wrap
the button in a tag.
This is related to #909.
As per #548, #723, and tsquillario/Jamstash#131, the current method of
estimating `Content-Length` creates various problems.
However, if headers such as `Accept-Ranges` is omitted, clients will only
use the first connection, which is `Transfer-Encoding: chunked`, and no
`Content-Length` is necessary.
Doing this has the side effect that (at least on the web player) seeking
to a specific time is no longer possible, thus this was made an opt-in
option.
Signed-off-by: WillyPillow <wp@nerde.pw>