PSR2 adjustments for the PassHash class

I opted for ignoring the camel case funtion check not because the public hash_*
methods are widely used but because I find this style actually cleaner
in this

PSR2 adjustments for the PassHash class

I opted for ignoring the camel case funtion check not because the public hash_*
methods are widely used but because I find this style actually cleaner
in this case where the method name is auto-built from the hash type
name.

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