Second solution for manifestFile params #508

Instead of #541 

we remove sourceManifestFile, make the default location of androidManifestFile to src/main/AndroidManifest.xml and make the default location of finalManifestFile to the build directory and use that variable in all mojos.... in that case we would break the config for people using sourceManifest & updatedManifest which is fine I guess. 


This would be valid for an AMP release 4.1 or 4.5 as it breaks configuration for people using sourceManifestFile and/or updatedManifestFile