[TIMOB-24829] Improve android build performance

[janvennemann]

JIRA: https://jira.appcelerator.org/browse/TIMOB-24829

This is the reworked version of #189, using the appc-tasks module and complete with unit tests backing the refactored code.

Change overview:

• Moved the Hyperloop wrapper sources from being processed by the normal Android build process. This was the main reason for slow performance because it required the minifyJs flag being forced to true to work properly, slowing down the JS processing. It will also no longer regenerate all wrappers on every build.
• Hyperloop wrappers will no longer be copied to the Resources directory which caused some confusion in classic apps. The hook will now generate all files under the build directory.
• All important build steps are now being able to work incrementally. This will allow the Hyperloop processing to only trigger for changed or deleted files instead all of them.

To properly work in master, this has to be tested together with #206

[sgtcoolguy]

Yay for tests! Do these actually run as part of the build? I'm guessing not. Can we please hook them up in the Jenkinsfile? Ideally we'd model this like many of the other npm packages, and have a Gruntfile that can do linting/testing of the JS code. If you'd like I can get us started in that direction and then we can hook the nyc/test stuff into it?