Keyline Icons v0.3.0: Sharp corners across the whole set

Sharp corners, across the whole set: 14,664 SVGs now, against 1,833 names, because every drawing has a squared-off twin. It is a switch in the browser rather than a second library, and it ships through the same doors the styles do.

1,497 drawings added since 0.2.0 without a new name, taking the set from 1,497 drawings to 2,994. 48 redrawn.