Label controls in keyboard about sgtpuzzles HOT 5 CLOSED

Going to do a bunch of this with icons.

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These make a huge improvement to the intelligibility of these keys. Great job!

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Images that aren't currently set, some of which can share existing ones:

• bridges: G (grid?), left (solid line), right (line of crosses), H (whatever)
• dominosa: left (domino), right (divider)
• filling: left (use square_filled?)
• flip: left
• galaxies: left (line), right (arrow)
• guess: L (circled a?)
• lightup: left (bulb), right (square dot)
• loopy: left (line), right (... grey line??)
• magnets: left (+), right (x)
• map: L (region with a 1 in?)
• net: J (shuffle)
• netslide: left/right? fine as they are
• pearl: left (line?), right
• range: left (filled), right (square dot)
• rectangles: left (rectangle), right (erase??)
• same game: left/right (dot/empty)
• signpost: left/right (???) (from here vs to here, without suggesting you click one to start and the other to finish...)
• singles: left/right (square/circle)
• sixteen: fine (same as netslide)
• tents: left (tent), right (filled square)
• twiddle: rotate left/right
• undead: creatures (or just encourage people to click the ones at the top somehow?) (and drag them when I get that far)
• unruly: squares

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Undead also wants to be left-button-only and use square_corner. (done 88a6cd1)

square_corner_asterisk should perhaps have 1 2 3 instead of an asterisk.

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Reopening just to add a sentence in docs in the bit I add to all controls sections, e.g. "On Android, [...] Also letter-key controls have been replaced with icons."

(Better wording / other 5-minute fix welcome, but I don't plan to go through and actually document the icons as such - but still I felt it better to have them, and have out of date docs, than have letter buttons.)

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