Add a standard method for general configuration of Anchovy/Step behavior

[pydsigner]

anchovy.simple.BaseStandardStep has encoding and newline attributes that some users might like to override. There is no simple way to do so without monkey-patching the class or overriding those attributes with a subclass everywhere they're inherited. Likewise, there are CLI arguments for Anchovy that cannot be specified in the Settings class. Supporting a more generalized dictionary — perhaps reworking Settings to be that more generalized option — would allow an obvious way to implement those features in Anchovy itself as well as similar features for those writing their own Steps.