added dataflow to stringy bitwise op, bitwise not op (fix #5957) #6084
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Hello
Fixes #5957
It appears addDataFlow was never called for bitwise operators with stringy (hasString() == true) operands.
And I could not find an implementation of "addDataflow" for unary operators, so I added one in BitwiseNotAnalyzer.
Added snippets from the original issue as a test and ran psalm on brick/math - no more UnusedVariable errors.