refactor(root): Introduce files module

[notjuanortiz]

Purpose

Edit: This change is one of many to come that will allow us to maintain a linear dependency tree when migrating the remaining utility classes into their respective packages, as discussed in #180.

Result

Moves abstract file parsers into a new module called files.

This also introduces the buildSrc directory which is automatically detected by gradle.

You can read more about why it exists and how it should be used here: https://docs.gradle.org/current/userguide/organizing_gradle_projects.html#sec:build_sources

[TravisBuddy]

Hey @notjuanortiz,
Your changes look good to me!

View build log

TravisBuddy Request Identifier: 77565890-6ea8-11ea-bef5-ab2a7fe30e4a

[stale[bot]]

This issue has been marked as stale because it has not had any recent activity. It will be closed if no further activity occurs.

[stale[bot]]

This issue has been closed because it has not had any recent activity. Feel free to re-open this issue or create another one if the problem isn't resolved.

[lare96]

I'm not gonna merge this for now, just because I want to have a full roadmap of how everything will be refactored first