[Merge] lp:~phablet-team/dialer-app/phone_settings into lp:dialer-app/staging

[Gustavo Pichorim Boiko]

Regarding the ListItem usage, this code was imported from ubuntu-system-settings. There are more things to update in there, so this will be addressed in a separate MR. The other comments (that were placed in the diff of the previous version of this MR) were addressed.
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https://code.launchpad.net/~phablet-team/dialer-app/phone_settings/+merge/320669
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