Add max anvil cost config and EnchantCommand mixin

Introduces a configurable max anvil cost via the config and enforces it in AnvilScreenHandlerMixin. Adds EnchantCommandMixin to support custom enchantment levels in the /enchant command. Updates mod version to 1.10 and registers the new mixin in the mixins config.

src/main/java/com/kasetoatz/superenchants/mixin/EnchantCommandMixin.java

@@ -0,0 +1,20 @@
+package com.kasetoatz.superenchants.mixin;
+
+import net.minecraft.enchantment.Enchantment;
+import net.minecraft.server.command.EnchantCommand;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import static com.kasetoatz.superenchants.util.Util.getCustomLevel;
+
+@Mixin(EnchantCommand.class)
+public class EnchantCommandMixin
+{
+    @Redirect(method="execute", at= @At(value = "INVOKE", target = "Lnet/minecraft/enchantment/Enchantment;getMaxLevel()I"))
+    private static int execute(Enchantment enchant)
+    {
+        int custom = getCustomLevel(enchant);
+        return (custom > 0) ? custom : enchant.getMaxLevel();
+    }
+}