Same Game: scale TILE_GAP with tilesize

TILE_GAP represents the gap between the coloured parts of adjacent
different-coloured tiles.  Rather than a fixed 2 pixels, it's now 1/16
of the tilesize (rounded to nearest).

This looks the same at the default tilesize of 32, but behaves better
with larger or smaller tilesizes.  At tilesizes below 8, the gap
disappears altogether, but that seems appropriate: at 7 pixels there's
not much space for the inner and outer squares and the cursor, and those
are all more important than the gap..

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