This commit restructures the lint.ignore project section to allow ignoring files on a per-linter basis. This still lets the user disable all issues for a given linter, but allows for finer-grained control. This is the current scheme (before this PR): ```yaml lint: ignore: linters: - library - classic files: - "elf.*" - lib/libfoo.so.1 ``` The two entries (`linters` and `files`) are unrelated and complementary: If `linters` has e.g. `library`, then all `library` linting is ignored, regardless of `files`. If `files` has e.g. "elf.*", then any linting issue found matching that glob will be ignored, regardless of `linters`. This is the new scheme implemented in this PR: ```yaml lint: ignore: library: - lib/libfoo.so.1 # Disable "library" linter only for lib/libfoo.so.1 classic: # Disable "classic" linter for all files ``` Since the way that this is described in the Pydantic model is a bit "less-than-intuive" in the way that `classic` being a key with `None` as value actually means "all" files, I added a couple of methods to use as the "public" API to hopefully hide that complexity a bit.