Changes

NEWT/OSX: exec. makeKeyAndOrderFront/makeKeyWindow on MainThread

NEWT/OSX: Proper impl. of NEWT's focus management (fixes NEWT/AWT focus behavior/tests)

- Old code was just requesting the focus and made the window upfront
  and notifying a gained focus to WindowImpl. (hack)

- Using proper requestFocus impl. issuing focusAction() and utilizing native
  focus gained/lost messages. This distinguish between 'makeKey' and 'orderFront'.
  Also requesting and accepting (view) first responder role, which is a precursor
  to proper gained/lost focus handling on OSX.

- NEWTCanvasAWT: Adding 'steal AWT focus':
   +++
   void requestFocus() {
     super.requestFocus(); // AWT
     < steal AWT focus >
     NEWTChild.requestFocus()
   }
   +++
   Helps make the focus traversal between NEWT/AWT more reliable.
   Happend on OSX that AWT (NewtCanvasAWT instance) didn't release the focus
   after NEWT child gained the same.
   We are not able to use the 'focusAction()' here (disabled in this code path)
   due to AWT-EDT blocking and recursive focus changes. The latter is also
   intendend to request the AWT focus first ..

- AWT/NEWT focus test 01 passes on OSX

test script

NEWT/OSX: Send events direct w/o EDT queue (like X11 and Win32)