[Applet]Update layout based on T10470

Summary:
Change layout according to T10470 mockups.
Remove port combobox and put port selection back the hamburger menu.
Compact representation tooltip shows only port description, if available.
Display only port description, if there is no other device with same
description sub-string.

Visual Issues:
Unable to extent the bottom line to touch the edges of the window,
that are part of the system tray.
Line svg has spacing on the sides.

1st part of patches D26271, D26256, D26418, D26574.
Not included in these patches: 100% volume mark, Color style.

Reviewers: #vdg, #plasma, manueljlin, drosca, ngraham

Reviewed By: #vdg, manueljlin, ngraham

Subscribers: cfeck, ndavis, filipf, ngraham, plasma-devel

Tags: #plasma

Maniphest Tasks: T10470

Differential Revision: https://phabricator.kde.org/D26271