Add: fisher, mskewb, pyramorphix, helicopter, curvycopter

[lgarron]

I consulted with Tony Fisher on the exact Fisher cube dimensions. I purposely put it at 45° to distinguish it from the Skewb family, but I'm open to using orthogonal alignment for the main outline.

[jfly]

LGTM!

[keemy]

talked offline. fine to merge.

stated reservation that fisher cube seems needlessly half the size all other cube icons but we can revisit if others mention it in the future.

[lgarron]

stated reservation that fisher cube seems needlessly half the size all other cube icons but we can revisit if others mention it in the future.

To follow up with a bit more: I'm also alright with going to orthogonal outline, but I'd like to try this to see if it works (and if we don't get too much confusion/negative feedback about it). In the small sample of folks I've spoken to, there's no clear preference so far, but Tony himself expressed a slight preference for diagonal.

Also, I'd like to fix up the sizes and spacings of the icons at some point, at which I think we could make the diagonal one slightly larger as well.