Add support for JustEnoughItems

Will build on as we add more recipe types.

src/main/java/WayofTime/bloodmagic/compat/jei/altar/AltarRecipeHandler.java

@@ -0,0 +1,33 @@
+package WayofTime.bloodmagic.compat.jei.altar;
+
+import mezz.jei.api.recipe.IRecipeCategory;
+import mezz.jei.api.recipe.IRecipeHandler;
+import mezz.jei.api.recipe.IRecipeWrapper;
+
+import javax.annotation.Nonnull;
+
+public class AltarRecipeHandler implements IRecipeHandler<AltarRecipeJEI> {
+
+    @Nonnull
+    @Override
+    public Class<AltarRecipeJEI> getRecipeClass() {
+        return AltarRecipeJEI.class;
+    }
+
+    @Nonnull
+    @Override
+    public Class<? extends IRecipeCategory> getRecipeCategoryClass() {
+        return AltarRecipeCategory.class;
+    }
+
+    @Nonnull
+    @Override
+    public IRecipeWrapper getRecipeWrapper(@Nonnull AltarRecipeJEI recipe) {
+        return recipe;
+    }
+
+    @Override
+    public boolean isRecipeValid(@Nonnull AltarRecipeJEI recipe) {
+        return recipe.getInputs().size() > 0 && recipe.getOutputs().size() > 0;
+    }
+}