Initial Work on Rituals

Added the framework for Rituals, including the automatic registration of rituals using the annotation.
This includes:
- The Master Ritual Stone
- The regular Ritual Stones (all 7 types)
- The Ritual Registration system
- The activation crystal items.
- Reintroduction of the Demon Will Aura (changed saved Dimension ID from Integer to ResourceLocation)

Localization needs to be completed, as well as the implementation of all the rituals.

src/main/java/wayoftime/bloodmagic/ritual/imperfect/IImperfectRitualStone.java

@@ -0,0 +1,20 @@
+package wayoftime.bloodmagic.ritual.imperfect;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+
+/**
+ * This interface is for internal implementation only.
+ * <p>
+ * It is provided via the API for easy obtaining of basic data.
+ */
+public interface IImperfectRitualStone
+{
+
+	boolean performRitual(World world, BlockPos pos, ImperfectRitual imperfectRitual, PlayerEntity player);
+
+	World getRitualWorld();
+
+	BlockPos getRitualPos();
+}