Android APK D2D: refine Android APK analysis

[pombredanne]

This is a series of follow up refinements after:

• Android APK D2D: Analyze Android APK to map app binaries with source code #1366

These are some improvement to consider for metadata and Kotlin:

• Android APK D2D: Collect metadata from manifests #1378
• Android APK: support kotlin decompilation #1392

And to improve Maping native code (though is is already basically working for ELFs)

• Android APK D2D: Extract symbols from native binaries such as ELFs #1375
• Android APK D2D: Map native binaries to source code (C/C++, etc) #1393

And to report Android-specific issues:

• Android APK D2D: Report issues from the Android specific d2d steps #1394

And to improve matching:

• Android APK D2D: Extend and refine code matching to PurlDB #1395