Android sdk

[shjortConcordium]

Purpose

Add support for android / building a AAR artifact.

Changes

• Added commands to add android targets and build the native lib for those targets in the make file.
• Added new maven module to build AAR artifact for android.
• Added android specific behaviour in NativeResolver.
• Moved package version into a parent module.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[MilkywayPirate]

Looks good, GJ.

I have a few comments/questions that I would like to be adressed/answered before merge.

[MilkywayPirate]

Looks good! GJ