Describe your changes

• Added internal support for skins (not yet user configurable).
• Added color capability detection and selection of a suitable skin based on the results.

PR requirements

• I have followed the guidelines in the Contribution Guide document.
• I have checked that there aren't other open Pull Requests for the same update/change.
• I have confirmed locally that there are no linting issues.
• I have confirmed that all tests pass locally.
• I have confirmed that my changes do not negatively impact performance by manually comparing before and
  after performance against a suitable local directory tree.
• I have confirmed that code coverage has not regressed as a result of my changes.