[#60] Adds setting for disabling Yii Debug Bar

[joshuapease]

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[joshuapease]

Thanks for calling that out.

Unfortunately user preferences are read-only in Craft 4, so we can't do our previous method of overriding those.

Hopefully no Debug savvy editors at BEF. Fortunately they only have 2 users, so we can communicate that limitation easily if need be.