add full dime printing: wood, woad, part of rend:co

it would be useful to encode dimes into cords on a js client.

that way a client can send a typed atom instead of needing to handle
parsing on the backend.

for dates and numbers the encodings to strings are fairly simple:

~yyyy.m.d..h.mm.ss
0x0000.0000
etc

but i do not know of a way to do knot escaping in javascript.

please let me know if there's already a way to do this

so i propose adding to this js library +wood, +woad, and the js equivalents
of +rend:co for turning JS objects into dime strings.

> (wood 'foo bar!')
~.foo.bar~21.

> (woad ~.foo.bar~21.)
'foo bar!'

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