Draft: Add PCF85263

[networkfusion]

Description

Although similar in name to the PCF8563, the PCF85263 is a more capable device and is not register compatible. This works towards a fully functional driver, but as default adds the minimal capabilities.

Motivation and Context

Used by OrgPalThree

How Has This Been Tested?

Screenshots

Types of changes

• [ ] Improvement (non-breaking change that improves a feature, code or algorithm)
• [ ] Bug fix (non-breaking change which fixes an issue with code or algorithm)
• [x] New feature (non-breaking change which adds functionality to code)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Config and build (change in the configuration and build system, has no impact on code or features)
• [ ] Dependencies (update dependencies and changes associated, has no impact on code or features)
• [ ] Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• [ ] Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• [ ] My code follows the code style of this project (only if there are changes in source code).
• [ ] My changes require an update to the documentation (there are changes that require the docs website to be updated).
• [ ] I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• [ ] I have read the CONTRIBUTING document.
• [ ] I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• [ ] I have added new tests to cover my changes.