Work on adding converters for some arguments

worldedit-core/build.gradle

@@ -33,6 +33,9 @@ dependencies {
     implementation "org.enginehub.piston.core-ap:runtime:$pistonVersion"
     annotationProcessor "org.enginehub.piston.core-ap:processor:$pistonVersion"
     api "org.enginehub.piston:default-impl:$pistonVersion"
+    def avVersion = "1.6.5"
+    compileOnly "com.google.auto.value:auto-value-annotations:$avVersion"
+    annotationProcessor "com.google.auto.value:auto-value:$avVersion"
     //compile 'net.sf.trove4j:trove4j:3.0.3'
     testCompile 'org.mockito:mockito-core:1.9.0-rc1'
 }