Firmware for the latest version of the Katana60, which includes a trackpoint device

[rominronin]

Description

The Katana60 now provides the possibility of an optional trackpoint device

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• 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.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[zvecr]

From the PR checklist:

• PRs should contain the smallest amount of modifications required for a single change to the codebase
  • multiple keyboards at the same time is not acceptable

Please also resolve the issues flagged by qmk lint.