Consider to reinstate the OFF log level

[ndrlndr]

In the current version of TraceLog, the lowest log level is ERROR.

I'm running a use case where I'm interested the log output of only a single tag, regardless of any errors in other tags.

This would only be possible by setting LOG_ALL=OFF, which is no longer an option. I would like to request the ability to do so, which will then allow me to use LOG_PREFIX_TagIAmInterestedIn = INFO, to only see all the INFO and below logs, and only for the tag I am interested in.