more (browser) trackball-is-a-mouse work in progress

WebViewCore.cpp:
Add parameter to CachedRoot::findAt to suppress check for
hidden nodes. This helps find a best match for newly built
nav caches.

Require that the new cursor node closely match the bounds
of the prior cursor node. This may need tuning.

CacheBuilder.cpp:
Remove isInput flag on cached nodes (no longer used)

CachedFrame.cpp:
Add hideCursor to complement clearCursor. Hide prevents
the cursor from drawing but does not move it. Clear removes
it altogether so that the next movement starts from the viewPort
edge.

CachedHistory.cpp:
Don't special case text fields when doing history navigation.
This special casing in part allowed setting the focus to
the homepage input, but since focus is no longer set by nav,
it is not required.

CachedNode.cpp:
Add hideCursor; clean up debugging

CachedRoot.cpp:
Use navBounds from history instead of cursor bounds to
determine next move. Clean up some obsolete code.

WebView.cpp:
Add hideCursor; call it when appropriate.

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