Add models of JSON-java, aka org.json

Author: smowton

java/ql/src/semmle/code/java/dataflow/ExternalFlow.qll

@@ -85,6 +85,7 @@ private module Frameworks {
   private import semmle.code.java.frameworks.jackson.JacksonSerializability
   private import semmle.code.java.frameworks.JavaxJson
   private import semmle.code.java.frameworks.JaxWS
+  private import semmle.code.java.frameworks.JsonJava
   private import semmle.code.java.frameworks.Optional
   private import semmle.code.java.frameworks.spring.SpringCache
   private import semmle.code.java.frameworks.spring.SpringHttp