Implement a Eel-ViewHelper
To make Eel available in Fluid-Templates, Eel (or Fluid) should provide an simple ViewHelper.
It should accept an eel expression argument (string, might already be parsed/rendered by fluid), passes that to Eel and return the result. The Fluid TemplateVariableContainer should be passed as the Eel "Context" to access the Fluid variable values within Eel.
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