fix: allow programmes beginning with '-' to be specified on the comma…

…nd-line

Adds allow_hyphen_values = true to the prog positional argument so clap
accepts values starting with a hyphen (e.g. '-3' for negative index
selection).

Fixes #10

feat: make help prettier

fix: use `gh release` to release

feat: --csv, -d<delim> (split) and -D<delim> (join) flags

--csv splits CSV files, -d specifies the default split delimiter, and -D
specifies the default join delimiter.

feat: support escape sequences in unquoted single-char delimiters

Extends S and J operators to accept escaped characters like \0, \n, \t,
\xNN, and \uNNNN without requiring quotes. For example, S\0 now splits
on the nul character.

Fixes #1

refactor: -p prints command after output not before

fix: clear bottom and rewdraw on resize

This somehow got lost in a past refactor.

feat: add history support