play: introduce play_run_slice()HEADmaster

Sometimes a more granular main loop integration is required.
In such situations play_run() taking over is untenable, so this
splits out the body of play_run()'s loop as a separately callable
function.  Existing main loops can use this to run the play main
loop for a single slice.

The impetus for this has been experimenting with escripten
support in SARS, e.g.

emscripten_set_main_loop_arg((void(*)(void *))play_run_slice, play, -1, 1);

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