[Merge] lp:~phablet-team/ubuntu-system-settings/main_list_view into lp:ubuntu-system-settings

[Jonas G. Drange]

The proposal to merge lp:~phablet-team/ubuntu-system-settings/main_list_view into lp:ubuntu-system-settings has been updated.

Commit Message changed to:

* Replaces the grid with a list
* Replaces MainWindow search with PageHeader search
* Adds testing of new PageHeader search (and mocks PluginManager. This is a bit hacky, since SystemSettings implicitly provides PluginManager in main.cpp)

For more details, see:
https://code.launchpad.net/~phablet-team/ubuntu-system-settings/main_list_view/+merge/308521
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