2.6.0 json cleanup

[BoyStijn]

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Changes

Removed unused (de)serialization methodes

• removed java.io.Serializable interface from classes
• removed serialization method from classes (or changed to toString if the method was used)
• removed deserialization method from classes (or changed to fromString if the method was used)

[SparklingComet]

We are not merging into master, but into 2.6.0. I am assuming you forked TradeShop:2.6.0 anyway. Could you please resubmit?

[BoyStijn]

My bad

[SparklingComet]

Future reference: resubmitted in #147 .