as suggested by Ossi, part of the move to QtC infra

- Fixes in AlbumArtRow
  * fixed undefined cover art
  * corrected pathItemCount number
    in PathView
  * fixed spinner causing animation
    missbehavior
  * removed not needed comments
- Fixes in Music
  * corrected typos
  * moved contentType checks for
    unique ids into properties
  * changed widget3Rows state to
    extend widget2Rows as agreed
- Changes in MusicStore
  * added indexerProgress property
    needed for spinner in AlbumArtRow

As per specification, states in music content should be remembered
when switching from artists to albums and a specific artist was selected
before should return back to that when switching from albums to artists again
and vice versa

- New background images
- Fix 'add widget' popup size

 - The grid of applications has different margings from the left, right and top sides
 - The button "Finish editing" uses the default style
 - The top four application buttons move up/down depending on that if there is an active application
 - All behaviors on properties are replaced by states to make all animations work simultaneously

In preparation for moving the project to code.qt.io/qt-apps/triton-ui.git

The fixes are about coding style, line ending format, typos, missing
copyright header and tab characters.

It's way more convenient to use

Closes #157

searches for PNGs in the app's asset subdir, supports
the light/dark theme variants

 - Change the temperature sliders
 - Add new climate buttons such as steering wheel heating and circulation
 - Add adjustment of air flows
 - Redesign the popup header

Closes #155

Also renamed the variables to reflect this is the phone, not music, app

* Fixed background image
* Fixed dial pad
* Removed comments from Phone.qml
  as they have been transfered into issues

until we have some real content for it

and make it possible to move the widget by dragging anywhere except
the close button

Add a reconnection timer that will be started in the case of a timeout.
Tries to to reconnect to the previous url on a regular interval.

Was XS corrected to be S

turn the imperative nature of the checkable buttons to be more declarative

- add styling to Switch
- remove hover background elements
- use Light font consistently
- use triton-ui's animations

[Vehicle App] Support panel width changed according to spec. Car 3D view height changed according to spec. Panel top margin changed according to spec.