archco: implement clone and configure subcommands

Manages Git packaging repositories and helps with their configuration
according to distro specs.

Git author information and the used signing key is set up from
makepkg.conf read from any valid location like /etc or XDG_CONFIG_HOME.

The configure command can be used to synchronize the distro specs and
makepkg.conf settings for previously cloned repositories.

The unprivileged option can be used for cloning packaging repositories
without SSH access using read-only HTTPS.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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