[#75936252] Shrink left column in 50px increments from 400px to 200px
on small displays, scaling down game visualization area and sometimes
pushing ani-gif icon to below the instructions. Jump through a few
hoops to preserve button clickability and workspace height.
[#75936252] Make left-side buttons responsive to width: convert
run/reset, step, slider, arrow and share controls to inline-block;
wrap spelling controls in a table.
Merge pull request #793 from code-dot-org/responsive

Make left column responsive to width in all blockly puzzles.