Refactoring mojo tests.
-Replaced the way the MavenProject injected to a non-deprecated way (to get rid of the warning during the build).
-Updated mavenInvokerPluginVersion and extracted it as a pom-property.
-Extracted some RAT mojo integration test methods into a separate RatTestHelpers in order to find integration tests more easily after RAT-168 and the NPE when trying to forge 0.11.
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