Detach maven-cli from maven-embedder (deprecated). Basically, classes are copied from embedder to cli, while embedder points to old classes and cli to new classes. **One important exception is logging**: the classes are _moved_ to cli, and embedder modified to use those classes (and dependency reversed: embedder now depends on cli). Reason is Verifier, that still calls into "hack method" of deprecated MavenCli, and then without logging classes move would explode due casting.
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https://issues.apache.org/jira/browse/MNG-8332
As counterpart to maven.repo.local.tail, but this one "prepends" while other "appends". This means one can do like this
```
$ mvn install -Prun-its -Dmaven.repo.local.head=~/.m2/repository-it
```
And have stuff installed into dedicated IT local repo (as IT bits must be installed), instead to pollute own local repo.
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https://issues.apache.org/jira/browse/MNG-8370
To have them listed in generated docs, as they were forgotten.
Also, adding a "compat" support for Maven 3.9.x property for chained reposes.
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https://issues.apache.org/jira/browse/MNG-8362
Tamas Cservenak
Guillaume Nodet