Fix WindowContext not reflecting changes to window size

[jamesreprise]

What is the goal of this PR?

We fixed a bug in WindowContext where resizing the underlying window was not reflected when getting its values (i.e. height, width, x and y). This fixes a bug where certain actions such as mouse hovering didn't render tooltips because of windowContext reporting the incorrect height and width.

What are the changes implemented in this PR?

We've expanded WindowContext so that it includes 2 inner classes:

• Test, a 'mock' testing window context.
• Compose, a window context that links to the window itself when Studio is launched with a window.

[grabl]

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