Make it configurable what classes are included in the freemarker template 
rendering context
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                 Key: MGNLSTK-577
                 URL: http://jira.magnolia-cms.com/browse/MGNLSTK-577
             Project: Magnolia Standard Templating Kit
          Issue Type: Improvement
          Components: templates
    Affects Versions: 1.2.3
            Reporter: Ernst Bunders
            Assignee: Philipp Bärfuss


It would be nice to be able to register classes under the template-renderer en 
paragraph-renderer configurations, so that those classes would be added to the 
template rendering context. 

STKTemplateRenderer could get a Map property like 'classesToInclude'
it would be nice if modules/standard-templating-kit/template-renderers/stk 
would be watched, and new classes would be added on the fly through 
content2bean.  STKTemplateRenderer would have to propagate this map to 
FreemarkerHelper

you could do something like this in FreemarkerHelper:

TemplateHashModel staticModels = wrapper.getStaticModels();
        try {
            for (String name : classesToInclude.keySet()) {
                TemplateHashModel model = (TemplateHashModel) 
staticModels.get(classesToInclude.get(name));
                map.put(name, model);
            }
        } catch (TemplateModelException e) {
            e.printStackTrace();
        }

That way all static methods of the class are available. 


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