Sun-setting QCA

[Albert Astals Cid]

QCA has served us well for quite some time, but it's time to sunset it.

The architecture is quite complex, its plugin based functionality means that 
you can never be sure if a given feature your app needs will be available or 
not and the features we use from it are small compared to the huge amount of 
features QCA actually has meaning the maintainance effort is bigger than it 
needs to be.

I've started 
  https://invent.kde.org/libraries/qca/-/issues/18
to collect the uses of QCA and plan for replacing it with appropriate crypto 
code/library directly.

Best Regards,
  Albert