This color has a standard 'transparency' checkerboard pattern which is especially useful for our scrolling tests where it makes scrolling easy to visualise.
Refs #2078, #2079.
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Adds -scrollViewWillScroll: and -scrollviewDidScroll: delegate methods to CPScrollView.
These methods are not in AppKit but exist in UIKit. Useful for lazy loading data in a view, for example a CPTableview.
Tested in the CPScrollView example.
Conflicts:
AppKit/CPScrollView.j
CPScroller: send action when dragging starts instead of immediately on mouse down.
Test: added delegate methods to the top-left scroll view in CPScrollView example and log.