Move TabBar to header, maximize volume to footer

Merged Noah Davis requested to merge work/ndavis/tabbar into master

After recieving complaints that the UI was being changed too frequently for reasons that aren't easy for users to guess, I've moved the controls around once again.

This layout is similar to older versions of the plasma-pa applet, but keeps the maximize volume checkbox in the footer.

To users using the stable version of Plasma, the mute and configure buttons will have been moved to the header and the maximize volume checkbox will stay in the footer

We should stop rearranging the UI of this applet for a while after this commit.



Edited by Noah Davis

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