factorio-dl: use the build argument when guessing versions

factorio-dl: also require a token for expansion build

factorio-dl: use the remote filename instead of hardcoding them

This is a breaking change. I noticed that the factorio team did change
the naming scheme in 2024.

factorio-dl: add support for -b expansion

factorio-dl: add support for email OTP

See https://wiki.factorio.com/Web_authentication_API

factorio-dl: loop until we get a password; enhance help text

factorio-dl: remove redundant code (version number grabbing from API)

factorio-dl: add -b: support alpha, demo and headless

Document -h switch

factorio-dl: use a new endpoint to get the latest versions

https://factorio.com/api/latest-releases is a very simple json to parse, that's
cool!

README.md: "just works"(TM) on macOS and Linux

factorio-dl: now detects the current platform

With this change, we can set defaults to values that make sense. Users are still
advised to use all switches deemed necessary for unattended services to avoid
breakage in the future though (in crontab(5) for example).

factorio-dl: use a better jq(1) syntax

We now use jq(1) itself to filter out null values.

factorio-dl: remove unnecessary tests

factorio-dl: always check that FACTORIO_TARGET is valid, before trying to download it

factorio-dl: sort -V, not sort -n

Not POSIX, but on FreeBSD, OpenBSD, macOS, GNU and probably WSL.

factorio-dl: check for the dependencies

README.md: update according to the recent 0.2.0 changes

factorio-dl: always use the token + drop support for FACTORIODL_CONFIG

New logic:
  We want a token
  1. Look for token + username in player-data.json
  2. If not available, resort to LOGIN+PASSWORD to get a token from
     https://auth.factorio.com  (see
     https://artentus.github.io/FactorioApiDoc/auth-api/)
  3. If still not available, abort

With this token, we can safely remove any use we had of cookies
With this new logic, jq(1) becomes a mandatory dependency

Rework the help text

factorio-dl: improve the help text