Add option for whether to ignore leading and trailing spaces in transformers tha

UGH! I thought it was buggy behavior and filed a case, then was pointed to this link. I would prefer to have all transformers behave consistently and not try to do things without user knowledge. Those can then be exposed as options. The transformers that led me to understand that they were doing something with trailing spaces were the SchemaMapper and FeatureMerger. In the case of the SchemaMapper, the built-in behavior was actually NOT desireable and was causing issues in the end result.

Yes, I had a featuremerger followed by a group by and the feature merger ignores the trailing space whilst the group by does not leading to erroneous results. I've ended up adding a string length test to my featuremergers to ensure leading/trailing spaces are not considered matches.