[system-settings] Settings application section headlines

[Ondrej Kubik]

In Settings application.
For example go to "Security&Privacy" view.

Headlines for "Security" and "Privacy" are confusing.
- they appear to be clickable, but without any response.
- they are lacking any visual differentiation from actual settings items.

Possible solution:
- increase spacing from the top, to break it from previous section
- use different font, or at least bolt font, to highlight it as section headline
- when clicked, do not highlight the line/row to give impression it's clickable

Same problem is all over the Settings application

[Matthew Paul Thomas (mpt)]

There's only a certain amount of punishment my designs can take before they stop working. Here System Settings is suffering from three separate toolkit problems.

First, as shown in the wireframe <https://wiki.ubuntu.com/SecurityAndPrivacySettings#Phone>, "Security" and "Privacy" aren't supposed to be list items at all -- they're supposed to be standalone labels introducing their respective lists. But this is impossible in the toolkit, which is bug 1242666.

Second, in the absence of a standalone label element, the System Settings engineers have used ListItem.Header, but this looks identical to a normal list item, which is bug 1191029.

And third, list items that don't do anything still look tappable. That's bug 1362305.