Support for pause/resume of game rendering loop (#476)

* added pause/resume

* don't override displaymode in game engine

* avoid setting light sensing display mode

docs/reference/game/pause.md

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+# Pause
+
+Pauses the game rendering engine to allow other animations on the screen.
+
+```sig
+game.pause()
+```
+
+### See Also
+
+[resume](/reference/game/resume)

docs/reference/game/resume.md

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+# Resume
+
+Resumes the game rendering engine after a pause.
+
+```sig
+game.resume()
+```
+
+### See Also
+
+[pause](/reference/game/pause)