Add spell charge-up sound

src/main/java/electroblob/wizardry/client/audio/MovingSoundSpellCharge.java

@@ -0,0 +1,36 @@
+package electroblob.wizardry.client.audio;
+
+import electroblob.wizardry.item.ISpellCastingItem;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvent;
+
+/** A special type of moving sound that stops when the player stops charging up a spell, either by releasing the mouse
+ * button or when the charge-up time has elapsed. */
+public class MovingSoundSpellCharge extends MovingSoundEntity<EntityLivingBase> {
+
+	public MovingSoundSpellCharge(EntityLivingBase entity, SoundEvent sound, SoundCategory category, float volume, float pitch, boolean repeat){
+		super(entity, sound, category, volume, pitch, repeat);
+	}
+
+	@Override
+	public void update(){
+
+		if(source.isHandActive()){
+
+			ItemStack stack = source.getActiveItemStack();
+
+			if(stack.getItem() instanceof ISpellCastingItem){
+
+				if(source.getItemInUseMaxCount() < ((ISpellCastingItem)stack.getItem()).getCurrentSpell(stack).getChargeup()){
+					super.update();
+					return;
+				}
+			}
+		}
+
+		this.donePlaying = true;
+	}
+
+}