Enhancement: export servlets into seperate (sub)package about eid-applet HOT 3 CLOSED

Further thoughts:

- split JSONServlet into JSONServlet and JSONGenerator (like PDF/KML/...)

- probably the JSON/PDF/...Servlet can be replaced with a generic Servlet 
calling 
generator

- new Generator interface/superclass, methods byte[] generate(EidData data); 
and 
String getMIMEType();

- instead of 1 export-package combining all export formats, create a package 
be.fedict.applet.export.pdf..., a be.fedict.applet.export.vcard...  


Benefits: applet package is cleaner, would allow for selective adding/removing 
export 
formats

I cannot do this for 1.0.1.GA since I need to keep binary compatibility at all 
time
for 1.0.x.GA releases.

Scheduled this for 2.0.