v2 (prerelease)

reorganized helpers into groups with namespace prefix (/)
improved io helpers
- add io/comment io/notice io/success io/shout io/header io/blockquote
- fun unicode prefixes

v1 name	v2 name
__local_docker	docker/local
__local_docker_compose	docker/local-compose
__deactivate_machine	docker/deactivate_machine
clone_or_pull	git/clone_or_pull (?)
docker_safe_name	docker/safe_name
error	die
error_noent	die/noent
error_perms	die/perms
error_exception	die/exception
fetch-url	network/fetch
get_cmd	find/cmd
get_group_id	find/gid_from_name
is_dirty	is/dirty
line_in_file	file/interpolate
log	io/log
normalize_flags	args/normalize
normalize_flags_first	args/normalize_flags_first
prompt_confirm	io/prompt_confirm
prompt_echo	io/prompt
runfunc	shell/execfn
set_cmd	deprecated
sed_inplace	file/sed_inplace
shell_detect	shell/detect
shell_eval_export	shell/evaluable_export
shell_eval_message	shell/evaluable_entrypoint
unrecognized_flag	args/unknown "flag"
unrecognized_arg	args/unknown or args/unknown "command"
warn	io/warn

v1 (release)