Extend ALTER EXTERNAL FUNCTION to adjust arguments
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                 Key: CORE-5158
                 URL: http://tracker.firebirdsql.org/browse/CORE-5158
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Dmitry Yemanov


v3.0 prohibits any system table updates. But it also closed an ability to 
change arguments for existing UDFs. For example, increasing length from 
CSTRING(100) to CSTRING(1000) is safe and I believe could be supported. 
Currently, ALTER EXTERNAL FUNCTION allows only module and entrypoint to be 
changed. Dropping is not an option due to dependencies.

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