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Add PrivateNamingConvention linter

Although the `NameFormat` linter has an option to allow for leading
underscores, it does not enforce the convention. It would be really
great to either have a linter that does this.

What I mean by enforcing privacy for the leading underscore convention
is, for variables, functions, and mixins that start with a leading
underscore, we should verify that:

- any definitions are used within the same file
- any uses are defined within the same file
- any uses are preceded by their definitions

I considered adding this to `NameFormat`, but it seems specialized
enough that I decided to put it in its own linter. I left the prefix
configurable but defaulting to `_`, which is likely what most people
would use anyway.

Fixes #721

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