Add vlogger(8)

vlogger(8) is a alternative to logger(1), by default it sends messages
from stdin to syslog.

The main reason to replace logger(1) is, that logger only connects once to
the syslog socket in default mode and puts all messages into the void if
syslog is not running at the time.
logger(1) has a new `--socket-errors=on` mode which would work, but some
void uses don't use syslog at all and in this case the log service would
constantly restart.

As a bonus vlogger(8) looks for /etc/vlogger and if its executable it
just executes it and is replaced by it.
This can be used to avoid syslog and just write all logs to files with
svlogd(8) as example, without having to edit all log services.

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