Meta: Add .mailmap to ascribe git commits to proper author.
From time to time a new commit will appear from an existing commit which has a different name or email address (or both) than an existing name or email address. This occurs because of changing names and changing emails and because of mistakes. Additionally, the svg-to-git process double-encodes names from profiles.wordpress.org causing corruption in names with non-US-ASCII characters.
This patch introduces a .mailmap file to alias committers so that:
- All contributions for a given person are shown for that person.
- Committers will be able to control or fix the display of their own name.
The .mailmap file is a standard git configuration.
Developed in https://github.com/wordpress/wordpress-develop/pull/7180
Discussed in https://core.trac.wordpress.org/ticket/61864
Fixes #61864.