Create text transformations

[pleonex]

Implement a configuration or similar class to apply text transformations. For instance, to replace back and forward characters like á. Also, to remove trailing spaces.

[pleonex]

The support for text tables will be handle as a new encoding for DataWriter and DataReaders (#54). Furthermore, it will extend some API to apply the conversion to text.

For other text transformation like trailing spaces needs to happen at a higher level since it needs to apply to all the encodings. That should be handled by the Converter reading the external text file, since depending on the file it may be or not supported removing trailing spaces. We could group these methods and utilities into a class.

[pleonex]

Implemented Replacer.

For general text transformation, I could implement a "Transformer" with several fields configured. We could a field into the TextReader, TextWriter, DataReader and DataWriter so they are done automatically.