Support anonymizer parameters for columns

[Pyeroh]

It's a suggestion, but also a way to specify this feature.

With the configuration file, it should be possible to pass parameters to a custom anonymizer. These parameters :

• are to be placed on a column node,
• interpreted as a Map in the Column class,
• if the anonymizer supports parameters (with an interface inherited from Anonymizer), it is called with the parameters.

I'm currently working on it, what do you think of it ?

[realrolfje]

Merged into develop, part of next release