Choose direction for padding binary

[gennyble]

it would be useful if you could pad binary to bytes in both directions.

I want 00000101 but that's a lot to type and not fun to read, what about .<101?

And 01110000 is .0111>?

not crazy about .< as it just look wrong, but i like the greater-and-less-than for the "expand this way". maybe we can implement and see how it looks.

This should only ever complete a byte, not complete a word (u16) or dword (u32) or whatever.