Use str_format_time and str_format_meta in file output. (these are the %char and $char variables defined in marq help)

Allow using format meta stuff in --snapshot-path when defining a filename (see marq help for available variables).

This was seemingly erronously added when Pause support was added.

* forward-port [17497] with the addition of an 'embedded' check, because this work-around triggers the fspanel to keep hidden all the time when using detached vouts. Ideas on this issue are welcomed ;)