general type conversion function parse_type that can be parametrised by piping different type classes
convert_to_internal wrapper function that sanity checks if the input conversion value is None type (None types crash the conversion process so we want to filter those out).
New features:
parse_typethat can be parametrised by piping differenttypeclassesconvert_to_internalwrapper function that sanity checks if the input conversion value is None type (None types crash the conversion process so we want to filter those out).closes #52