[test] Refactor InstallerTest
[test] More tests for Installer
[test] Test for IsolatedClassRealm.importAllPackages()
Implement EffectivePomGenerator
Implement POM resolution from metadata

If there is no POM file available in the system then XMvn will try to
generate one from metadata.
Interpolate Java home path
[refactor] Make ArtifactTypeRegistry non-singleton
Allow registering new artifact types
[refactor] Remove artifact types from ArtifactUtils
Don't forget to deploy artifact classifier
Hardcode legacy depmap directory path
Remove legacy JAR and POM repos from config
Fix warnings