Support different working directories for data

[guilherme-fh]

PR Details

• Adds chooseFolder method to Utils to give support to directory selection
• Defines workingDirectory that is defined according to what's set on the dataFolder.json (or else defaults to the root directory). Upon setting a new workingDirectory the dataFolder.json is updated accordingly
• Adds a section to the Options screen to display the working directory and a button to change said directory which updates workingDirectory

Description

This PR intends to give support to different working directories to access the data and test files.
Its purpose is to allow git synchronisation of these files, a feature that useful when working with teams.

Motivation and Context

This PR intends to ease synchronisation of data and test files among large (or even small) teams

Types of changes

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

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

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