Make mapper private[play] so Play can access it (#1244)

* Make mapper private[play] so Play can access it

* Clean up imports

Author: mkurz

play-json/jvm/src/main/scala/play/api/libs/json/JsonConfig.scala

@@ -13,11 +13,6 @@ import play.api.libs.json.JsonConfig.defaultDigitsLimit
 import play.api.libs.json.JsonConfig.defaultMathContext
 import play.api.libs.json.JsonConfig.defaultPreserveZeroDecimal
 import play.api.libs.json.JsonConfig.defaultScaleLimit
-import play.api.libs.json.JsonConfig.loadDigitsLimit
-import play.api.libs.json.JsonConfig.loadMathContext
-import play.api.libs.json.JsonConfig.loadMaxPlain
-import play.api.libs.json.JsonConfig.loadMinPlain
-import play.api.libs.json.JsonConfig.loadScaleLimit
 
 import java.math.MathContext
 

play-json/jvm/src/main/scala/play/api/libs/json/jackson/JacksonJson.scala

@@ -281,7 +281,7 @@ private[play] case class JacksonJson(jsonConfig: JsonConfig) {
     .streamReadConstraints(jsonConfig.streamReadConstraints)
     .streamWriteConstraints(jsonConfig.streamWriteConstraints)
     .build()
-  private val mapper = JsonMapper
+  private[play] val mapper = JsonMapper
     .builder(jsonFactory)
     .addModule(new PlayJsonMapperModule(jsonConfig))
     .build()