Commits on Jan 29, 2024

1. Add support for setting DFDL external variables …

   The name/value of NiFi dynamic properties are now treated as DFDL
   external variables. Property values are allowed to be NiFi expressions,
   which are evaluated and set as the variable values. If a property value
   evaluates to the empty string, it is ignored--this helps when a NiFi
   expression determines that a variable does not apply for a schema, since
   DFDL requires that all variables passed in externally must be valid for
   the schema. This does mean it is not possible to have a variable with
   the value of an empty string, but this should be rare and worked around.
   
   This also refactored exceptions, so that functions throw correct
   exceptions instead of turning everything into an IOException, which
   worked but is not technically correct.
   
   Also added a new "External Variables" section to additional details
   pages documening this capability, and cleaned up the additional details
   pages.

   

   stevedlawrence committed Jan 29, 2024
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