Changes in the ClassPath customizers.

Hi all,
in the discussion with Pavel B. we find out, tht there should be a pure declarative way how to modify the types of classapth customizers 
(for which classpath the customizers are shown) and the types of classpath in the combo box in the Add Java Resource Wizard.
To allow this Java module will register ClassPathCustomizer as a Customizer for the type PathContent and create a folder "Customizers/ClassPath/${customizer_type}"
on the project file system where Java module and other will place InstanceDataObjects representing objects of the type TemplateWizard.Panel,
 this panels will be presented to the user in the customizer of given type (Project. BuildTarget, ExecProfile).
 
Tomas