[cliptext] consider modifying wcwidth()

[midichef]

I noted that Visidata's wcwidth() gives different answers than jquasts's more comprehensive implementation of wcwidth():

An example of a character that might get a wcwidth() of 0 is u"\u0ccd" # Joiner, Category 'Lo', East Asian Width property 'N' -- KANNADA SIGN VIRAMA, taken from a test in jquast/wcwidth. Visidata's wcwidth() returns 1 for this character. But wcwidth() from jquast/wcwidth returns 0

@saulpw replied:
We may want/have to vendorize jquast/wcwidth and extend it for our purposes.
Originally posted by @saulpw in #2667 (comment)

I've opened this issue to hold future discussions of how Visidata may need to change its wcwidth() implementation.