double_comparisons: check for expressions such as x != y && x >= y

[ianbollinger]

This change expands the double_comparisons lint to check for expressions of the form x != y && x >= y and x != y && x <= y. Since the lint already checks for their dual (x == y || x < y and x == y || x > y, respectively) while also checking for x <= y && x >= y and its dual x > y || x < y, it seemed like these two new cases were, in some sense, missing.

Issues #685 and #753 appear pertinent here.

changelog: [double_comparisons] check and offer suggestions for expressions such as x != y && x >= y

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[ada4a]

Makes a lot of sense:)

(not an actual reviewer)

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