Add `reportUnscopedDisables` flag

[jeddy3]

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Ref: https://github.com/stylelint/stylelint/pull/2232#discussion_r96887239

Report disables not scoped to one or more rules.

Treated as a similar violation to reportNeedlessDisables.

This flag (reportUnscopedDisables) would trigger a violation for the following source:

/* stylelint-disable */

As no rule(s)/plugin(s) is/are listed.

[kmiyashiro]

Hmm, the changelog says that stylelint-disable-reason is deprecated and to consider contributing to this instead, but it seems like they are two different rules. stylelint-disable-reason checks for a separate comment before or after the disable comment, while this checks for 0 rules in the disable comment.

[jeddy3]

@kmiyashiro Thanks for spotting that. Yes, you're right. reportUnscopedDisables is meant as an alternative to the stylelint-disable-no-empty proposal that got mothballed. I've posted a PR to correct the CHANGELOG.

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