Added aar-from-aar and aar-from-apklib libraryprojects to test those uses cases.
Added libraryprojects-aar-from-aar
Added libraryprojects-aar-from-apklib
Added ref to parent POM for each module and made the version of android-maven-plugin configured in dependency management only at the top level (currently 3.8.3-SNAPSHOT but suggest this be changed to a release version).
Renamed aar-from-apklib to apklib-from-apklib since we are not going to support aar-from-apklib.
Removed apklib2 (it is totally replaced by apklib-from-apklib).
Added tests for all 4 dependencies within apk-with-deps.
Added tests for all 4 dependencies within apk-with-deps.
(2nd commit required because Windows doesn't handle mixed case filenames well).
Added tests for apk resources within apk-with-deps.
merged and cleaned up examples for aar consumption
Renamed mainapp to apk-with-deps for clarity
Removed explicit aar1 dependency from apk-with-deps to show that we can compiled against it transitively.
Minor variable name change in AAR1 for clarity.
Merge pull request #44 from william-ferguson-au/issue-438

Issue 438 - adding Aar dep classes to compile classpath