KInit - Current state and benchmarks

[David Edmundson]

Benchmarks of dolphin on a low end ARM laptop:
 Dolphin via QProcess: 1233ms
 Dolphin via Kinit: 1144ms

again a consistent saving in the order of ~7%

Initially I had wanted to scrap it, I'm now very conflicted.

I'll try to port all of plasma services to use it properly again and
see what difference that makes across a broad context over a wider
range of services.

David