NEW: Add first responder management based on content view to CPScrollView

[didierkorthoudt]

This will (un)set CPThemeStateFirstResponder on CPScrollView based on the content view.

For now, only CPTableView's can initiate first responder state on a CPScrollView (and only if there's no in-cell editing).

This should be adapted when global focus ring management will be added to Cappuccino.

With this PR, it's easy to add a focus ring around a CPScrollView containing a CPTableView which is the first responder of the window (this will be used by Aristo3).

[mrcarlberg]

@didierkorthoudt Can you please look into why the test case will fail.

CPScrollViewTest.......
addFailure test=[CPScrollViewTest testNotificationsRegistered]: Notications registered for the scrollView in the notification center are wrong expected:<@[
@"CPScrollerStyleGlobalChangeNotification",
@"_CPWindowDidChangeFirstResponderNotification"
]> but was:<@[
@"CPScrollerStyleGlobalChangeNotification"
]>

[didierkorthoudt]

@mrcarlberg Well, I've added a new notification listening in order to implement this new functionality. So I guess that the unit test is not adapted. I check immediately. Sorry for this.

[didierkorthoudt]

@mrcarlberg Done.

[mrcarlberg]

Merged! Thanks!

[cappbot]

Milestone: Someday. Label: #new. What's next? A reviewer should examine this issue.