Fixed featureLenghMenuProcessor which were not returning any value

Linked with dandelion/issue#113
Updated new configuration loading mechanism

* The new process now uses less reflection
* Each processor has its unit test!
* Some List<?> of the TableConfiguration object have been replaced by
Set<?>
* ExportConfMap attribute has been removed to ease the export enablement
(the ExportType was already registered in the ExportConf bean). All
linked objects have been updated accordingly
* the "appear" attribute is now called extraAppear instead of
featureAppear
* New Processor hierarchy in order to deal with generic processor (that
process primitive types) and custom ones
* All enumerations are now written in upper case
* Added comments, log and removed dead code
Updated Thymeleaf test

* Upgraded dependency version
* New common thtest
* The current dom.thtest now extends the common thtest