Concurrency crash during init due to forced atlas loading during construction

[cpw]

https://github.com/progwml6/ironchest/blob/1e7ee302281645adc6a15cee72d17bda16e74abb/src/main/java/com/progwml6/ironchest/client/tileentity/IronChestsModels.java#L42

This line is causing a client crash when multiple mods are present due to racing on the Atlas initialization.

Please move that code elsewhere in initialization.