Asynchronous refactor || Project Modernisation

[noopkat]

Description

Simplified many code flows in this library for better readability.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• 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
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• Any dependent changes have been merged and published in downstream modules
• Changes have been manually tested (please provide information on test platform using the fields below)

[coveralls]

Coverage increased (+29.07%) to 75.758% when pulling 13bf2f8 on remove-async-dep into 4c88107 on master.