[mythtv] Replace the QtWebKit code

[Gary Buhrmaster]

On Sun, Mar 13, 2022 at 6:11 AM Mark Spieth <mark at digivation.com.au> wrote:

> There is also the revisited and supported webkit but I had a hard time
> making that build so I disabled it instead.
>
> This could be looked at again.

>From time to time QtWebKit is revised to try to
keep it building, but it is woefully out of date
with upstream chromium and other bundled
software, and likely filled with vulnerabilities.
Considering it "supported" because it happens
to be able to be built is not really appropriate.
And while it may survive with Qt5 a bit longer,
there is no plan whatsoever to port it to Qt6.

QtWebEngine has been the documented
(and supported) replacement for quite some
time now in both Qt5 and Qt6 moving forward.
If MythTV wants/needs a browser widget
going forward, primary efforts should be
expended towards that porting (and figuring
out how/why MythUI is interacting poorly with
it, as it seems Paul H has done much of the
heavy lifting).