excludeDependencies: excludeAll at the project level

```scala
excludeDependencies += "org.apache.logging.log4j"
excludeDependencies += "com.example" %% "foo"
```

In the first example, all artifacts from the organization `"org.apache.logging.log4j"` are excluded from the managed dependency.
In the second example, artifacts with the organization `"com.example"` and the name `"foo"` cross versioned to the current `scalaVersion` are excluded.

oh man...... my favorite part of our code :)