[MNG-6961] extensions profile option

**[John Patrick](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=nhoj.patrick)** opened **[MNG-6961](https://issues.apache.org/jira/browse/MNG-6961?redirect=false)** and commented

I use the https://github.com/khmarbaise/maven-buildtime-profiler via .mvn/extensions.xml

But at the moment we checkin .mvn/extensions.xml.disabled. Then when someone wants to execute the profiler they rename it locally.

Can .mvn/extensions.xml had a profiles option added.

So extensions can be enabled via settings.xml activeProfiles and also command line switches.

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No further details from [MNG-6961](https://issues.apache.org/jira/browse/MNG-6961?redirect=false)