KMix UI orientation

[Trever Fischer]

I'm starting to have a look at a lot of the papercuts in kdemultimedia,
trying to polish up all the little details that bother me.

Here's my first question:

Does KMix really need vertical slider orientation?

How many people really feel that having two different layouts is a major
feature?

I've taken some screenshots of the two layouts, for reference:

Tray popup with horizontal: http://i.imgur.com/QrOuO.png
Tray popup with veritcal: http://i.imgur.com/vwY8Q.png

Mixer dialog with horizontal: http://i.imgur.com/PTMLt.png
Mixer dialog with vertical: http://i.imgur.com/8AuMS.png

I propose removing the vertical layout entirely on the basis that it
makes the text look so super squished in there and takes up a *ton* of
space in the tray popup. With PulseAudio support, it is very common to
have really long labels, as you can see in my screenshots.

As far as I can tell, the only benefit a vertical layout provides to the
user is it makes it look like one of those 1980s equalizer boxes.

>From a technical aspect, removing the vertical layout would clean up a
lot of the code.