Address modules folder location and mapping

[Leftbower]

Description

If docs are correct,then the Commandbox managed modules folder should be in the lib folder (along with Coldbox and Testbox). Ths requires a few changes:

1. Change the folder structure to point there
2. Add a installPathConventions directive in box.json to point new module installs there
3. Address the discrepency in the /modules cfmapping between the Applicationn.cfc files in the Public folder and the tests folder.

Please note that all PRs must have tests attached to them

IMPORTANT: Please review the CONTRIBUTING.md file for detailed contributing guidelines.

Issues

#13

Type of change

Please delete options that are not relevant.

• Bug Fix
• Improvement
• New Feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project cfformat
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes