CLI stdin/stdout stream improvements

[Lyrth]

The clue executable should treat a single dash - in place of the filename as "read script from stdin." This option is also used on multiple Linux command-line utilities with the same usage, and allows pipelines like this:
command /that/reads/a/file.clue | clue -t luajit - -o | luajit -

On a similar note, -o flag should suppress info messages (or maybe redirect them into stderr) from the output code. Having Compiled Lua code of file "(command line)": and Compiled file "(command line)" in 0.* seconds! around the output makes the compiled code difficult to use for other purposes (i.e. sending the output to a Lua interpreter). Probably applies to --struct and --token options too.

[Maiori44]

Maybe there could be a --suppress flag that removes all unnecessary prints?

[Markos-Th09]

This is also most of the time called --quiet and -q for short

[Maiori44]

This is also most of the time called --quiet and -q for short

Oh, yeah true

[Lyrth]

--quiet and -q is good, yes

[Lyrth]

Moved to #136

[Maiori44]

I'll close since it was moved