Prepared solution to simplify the filling of the files cache

[sparshev]

Yep, it's needed some major reorganization of the variables names to put the platform closer to the _download part of the name, but seems it works fine now. Hopefully it will help with the majority of the issues with parallel execution.

Related Issue

34

How Has This Been Tested?

Manually

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.