Just enough wizardry!

- Adds JEI support for arcane workbench 'recipes' (charging, upgrading, and scroll enchantment)
- Adds an item transfer handler for said recipes, including bookshelf virtual slot support
- Prevents conjured items from showing up in JEI

src/main/java/electroblob/wizardry/inventory/ContainerArcaneWorkbench.java

@@ -197,12 +197,8 @@ public class ContainerArcaneWorkbench extends Container implements ISpellSortabl
 
 					// Show however many spell book slots are necessary
 					for(int i = 0; i < spellSlots; i++){
-						
-						float angle = i * (2 * (float)Math.PI)/spellSlots;
-						int x = centreX + Math.round(SLOT_RADIUS * MathHelper.sin(angle));
-						// -cos because +y is downwards
-						int y = centreY + Math.round(SLOT_RADIUS * -MathHelper.cos(angle));
-						
+						int x = centreX + getBookSlotXOffset(i, spellSlots);
+						int y = centreY + getBookSlotYOffset(i, spellSlots);
 						showSlot(i, x, y);
 					}
 					
@@ -216,6 +212,20 @@ public class ContainerArcaneWorkbench extends Container implements ISpellSortabl
 		}
 	}
 
+	/** Returns the x offset (relative to the central slot) of the ith book slot when the total number of book slots is
+	 * equal to {@code bookSlotCount}. */
+	public static int getBookSlotXOffset(int i, int bookSlotCount){
+		float angle = i * (2 * (float)Math.PI) / bookSlotCount;
+		return Math.round(SLOT_RADIUS * MathHelper.sin(angle));
+	}
+
+	/** Returns the y offset (relative to the central slot) of the ith book slot when the total number of book slots is
+	 * equal to {@code bookSlotCount}. */
+	public static int getBookSlotYOffset(int i, int bookSlotCount){
+		float angle = i * (2 * (float)Math.PI) / bookSlotCount;
+		return Math.round(SLOT_RADIUS * -MathHelper.cos(angle)); // -cos because +y is downwards
+	}
+
 	// FIXME: Shift-clicking a stack of special upgrades when in the arcane workbench causes the whole stack to be
 	//		  transferred when it should be just one (this is a bug with vanilla as well - try putting a stack of
 	//		  bottles into a brewing stand). I have at least made it so only one gets used now, so it has no impact on