task manager lines instead of blocks

[Eike Hein]

Hi Andreas,

task.svgz is really non-trivial to get right, partly because
the Task Manager has a lot of non-obvious modes. I trust you
guys, but please make sure that any changes to it goes through
Review first and that I get enough time to have a look. I
spent hours (yes, hours of fiddling!) fixing the current one
last time and know all the issues pretty well.

As for the issue - I like the simple look of blocks, but on
the other hand the lines are a pretty unique visual identity
which is nice and recognizable on screenshots. I like the
lines as a visual byline for Plasma.


Cheers,
Eike