Add pad settings; improve json serialization

PlayWallServer.iml

pom.xml

...tobias/playpad/server/json/BooleanSerializerHandler.scala

.../tobias/playpad/server/json/DoubleSerializerHandler.scala

...obias/playpad/server/json/DurationSerializerHandler.scala

.../de/tobias/playpad/server/json/IntSerializerHandler.scala

src/main/scala/de/tobias/playpad/server/project/Pad.scala

src/main/scala/de/tobias/playpad/server/project/Page.scala

.../tobias/playpad/server/project/loader/sql/PadLoader.scala

...de/tobias/playpad/server/project/saver/sql/PadSaver.scala

...cala/de/tobias/playpad/server/project/settings/Fade.scala

...ain/scala/de/tobias/playpad/server/server/SqlHelper.scala