Disable automatic Jackson object->JSON features

These were frequently resulting in logging failures from trying to use
reflection to make things public and cyclical object references.

The main areas this affected were Jetty servlet request objects and the
built-in Java HTTP client.

src/com/kroo/typeset/logback/JsonLayout.clj

@@ -8,7 +8,7 @@
            (java.util HashMap List Map Map$Entry)
            (org.slf4j Marker)
            (org.slf4j.event KeyValuePair)
-           (com.fasterxml.jackson.databind ObjectMapper SerializationFeature))
+           (com.fasterxml.jackson.databind MapperFeature ObjectMapper SerializationFeature))
   (:gen-class
    :extends ch.qos.logback.core.LayoutBase
    :main    false
@@ -46,7 +46,13 @@
   (-> (j/object-mapper opts)
       (.disable SerializationFeature/FAIL_ON_EMPTY_BEANS)
       (.disable SerializationFeature/FAIL_ON_UNWRAPPED_TYPE_IDENTIFIERS)
-      (.enable SerializationFeature/WRITE_SELF_REFERENCES_AS_NULL)))
+      (.enable SerializationFeature/WRITE_SELF_REFERENCES_AS_NULL)
+      (.enable SerializationFeature/WRITE_ENUMS_USING_TO_STRING)
+      (.configure MapperFeature/CAN_OVERRIDE_ACCESS_MODIFIERS false)
+      (.configure MapperFeature/OVERRIDE_PUBLIC_ACCESS_MODIFIERS false)
+      (.configure MapperFeature/AUTO_DETECT_GETTERS false)
+      (.configure MapperFeature/AUTO_DETECT_SETTERS false)
+      (.configure MapperFeature/AUTO_DETECT_FIELDS false)))
 
 (defn -init
   "Method invoked during object initialisation.  Sets the default value for the