UIAHandler.isNativeUIAElement: Don't assume all MSAA proxies are not native UIA....

UIAHandler.isNativeUIAElement: Don't assume all MSAA proxies are not native UIA. Instead, check whether the nearest window claims to natively support UIA.
This is because some controls implement UIA at their root but then use MSAA proxies beneath. We still want to use UIA in these cases, as MSAA ignores events for all windows which natively support UIA.
Among other things, this fixes the lists in the Windows 7 Firewall and Default Programs control panels.