Make methods needed for Iron Chests accessible (#206)

Author: keplersj

patchwork-fml/src/main/resources/patchwork-fml.accesswidener

@@ -1,2 +1,4 @@
 accessWidener   v1  named
 accessible  field   net/minecraft/client/MinecraftClient    textureManager  Lnet/minecraft/client/texture/TextureManager;
+accessible  method  net/minecraft/client/gui/screen/Screens register        (Lnet/minecraft/container/ContainerType;Lnet/minecraft/client/gui/screen/Screens$Provider;)V
+accessible  method  net/minecraft/container/ContainerType   <init>          (Lnet/minecraft/container/ContainerType$Factory;)V