Experimenting to make video visible.

Removed the hack to set translucent window background in the mediaplayer.

Then tried the following:
1. Direct write to backing store: does not work (backing bitmap is 16MU)
2. Set window background color: does not work (is over-written by control's Draw function)
3. Brush using CWindowGc from widget's paint event: does not work (is over-written by control's Draw function)
4. Hack QSymbianControl to blit a transparent bitmap from the Draw function: does work
5. Hack QSymbianControl to brush using CWindowGc from the Draw function: does work

Configuration 5 is the one being committed.

Other things we could try:
6. Trigger switch to 16MA backing store if child widgets have been created.  This could be tested by calling RWindowTreeNode::Child on the TLW's window.
	- Maybe we could test whether the child window's display mode is 16MA?
7. Somehow tell QSymbianControl not to draw anything at all
	- Based on setting Qt::WA_PaintOnScreen?
	- Then we either:
		- (Ideally) do nothing, and rely on video stack to paint the necessary transparency
		- Brush using CWindowGc from widget's paint event

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