Minimal bringup under GNOME Wayland

[quozl]

Not for merging.

Demonstration of what is required to start the Sugar Home View from
within a GNOME Terminal on a Wayland session.

• fix a silent fail to start with a premature exit status 1 by removing
  all calls to the Wnck library; this breaks window switching to
  Neighbourhood View, Group View, or Journal, and detection of activity
  startup completion,

• fix a segmentation fault in XQueryExtension by removing the
  CursorTracker initialisation; this breaks The Frame,

• fix a segmentation fault in libxklavier by removing keyboard
  configuration,

• fix failure to redraw home view by removing GStreamer, both the thread
  initialisation and the toolkit SpeechManager; this breaks speech in
  the shell only.

Other regresssions;

• mouse pointer is "busy",

• not fullscreen, has title bar,

• view switching keys don't work,

• right-click and mouse-over menus are incorrectly positioned,

• My Settings, Keyboard does segmentation fault in libxklavier,

• Journal is not shown.

Things that work;

• new user dialog,

• home view, favourites view, list view,

• my settings; everything except Keyboard,

• the Log and Calculate activities.

[chimosky]

Thanks for looking at this, interesting changes so far and it seems like you can't grab an active window or Wayland automatically displays on a particular window.

Can't really remember the details when I'd taken a look at this but I think it's one problem with Wayland.