Pause button and menu #18
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nicklockwood
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This PR adds a pause button to the in-game HUD, and a pause screen menu.
This was not a simple thing to implement due to the separation between rendering and game engine, which makes it hard to map on-screen touches back to the position of controls.
The solution involves a Swift UI-like declarative layout system so that the screen position of views such as buttons can be computed independently of rendering.