*{.sh,run}: use command instead of deprecated echo_run (don't prepend anything when the command is already aliased with `command`)

lib/sh/util.sh: command(): perform echo_run_prep itself instead of requiring echo_run to be added in an alias. echo_run_prep will not be performed if limit_stderr_cmd() has performed it already outside the limit_stderr section. this requires using `builtin command` instead of "command" when you don't want the echoing (such as in include_guard_var()).

*{.sh,run}: multi-command aliases: enclose in {} so the alias can be used after ||

bugfix: lib/sh/util.sh: .(): also need to echo the . before the included file

lib/sh/util.sh: added echo_params alias and use it instead of `log "$*"`

lib/sh/util.sh: .(): echo the include at log_level 2 because it's an internal command

lib/sh/util.sh: echo_cmd(): also remove `builtin` before the command name

lib/sh/util.sh: echo_cmd(): don't remove -- after command, because it is added by the command() function instead and does not appear in the command sent to echo_run()

lib/sh/util.sh: command alias: don't alias-expand next word, because the next word should only be interpreted as a command (part of the effect of the `command` builtin)

lib/sh/util.sh: external commands: always use command rather than echo_run to indicate that a command is external, because command() ensures that what it invokes is not a shell function, and sets 2>&22 where needed