Add support for JustEnoughItems

Will build on as we add more recipe types.

src/main/java/WayofTime/bloodmagic/compat/ICompatibility.java

@@ -0,0 +1,17 @@
+package WayofTime.bloodmagic.compat;
+
+/**
+ * Implement on all primary compatibility classes.
+ */
+public interface ICompatibility {
+
+    /**
+     * Called after the given {@code modid} has been verified as loaded.
+     */
+    void loadCompatibility();
+
+    /**
+     * The {@code modid} of the mod we are adding compatibility for.
+     */
+    String getModId();
+}