Libtaskmanager ported to Qt5/KF5

[Martin Graesslin]

Hi all,

on special request by Eike I looked into porting libtaskmanager to Qt5/KF5. 
And after a surprisingly easy port I just pushed to frameworks-scratch branch 
a commit which enables building of libtaskmanager again.

As a side effect I also had to port ksysguard/processcore.

Obviously I have not tested whether the code works but we should notice soon 
enough when the tasks applet gets ported ;-)

Cheers
Martin