activate message fix: a call to .Show now waits until both WM_SHOWWINDOW and

WM_ACTIVATE have been processed before returning, so it is guaranteed that
once it returns and the form is visible, it is actually on the screen on X11

* ContainerControl.cs: Only send focus to the control if the top container
  is already focused. This is so that, when a form is first shown, all
  the enter/leave events are done first before any focus stuff comes in.
  If a control has no top container, there's an extra check on Control.Focus
  to make sure it gets focused in this particular case.

* Control.cs: Force focus if the control is active but did not receive
  focus after being set as active.

* MdiClient.cs: Dispose the form when closing

* XplatUIX11.cs: When mapping and unmapping windows, make sure the call
  doesn't return until both WM_SHOWWINDOW and WM_ACTIVATE have come in
  if the window is a top Form.
  Reset all hwnd properties when the window has been destroyed so that
  we don't land in any codepaths that might try to do something with it.
  Added a bunch of debugging messages. If TRACE is defined, all X calls
  are logged through DebugHelper. Set a few missing EntryPoint attributes.

* System.Windows.Forms.Internal/DebugHelper.cs: Added. Wrapper for Debug.*
  methods, with some extras to ease debugging.

* System.Windows.Forms.Internal/Accessor.cs: Added. Provides access to
  various internal properties, for testing purposes.

svn path=/trunk/mcs/; revision=117533

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