Produce a warning for aar projects with apklib dependencies

This is a basic fix for an issue #337 with APK or AAR project having a dependency of AAR type, which in turn explicitly or implicitly depends on APKLIB artifact. When putting together the list of all transitive dependencies for current project, code looks up all AAR artifacts, and checks for any APKLIB dependencies for each of them. For each located "deprecated" dependency combination, a warning message is produced if corresponding Mojo parameter is set.

TODO: Think about a proper wording for both warning messages (first one for AAR project with APKLIB libraries, second one for any project with AAR dependencies, which explicitly refer to APKLIB libraries).