Added ReflectionUtils helper class to find Fields with @Interpolate annotation in superclasses (Interpolators didn't account for Fields in AdvancedPosition inherited by Position)

src/main/java/eu/crushedpixel/replaymod/utils/ReflectionUtils.java

@@ -0,0 +1,24 @@
+package eu.crushedpixel.replaymod.utils;
+
+import eu.crushedpixel.replaymod.interpolation.Interpolate;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ReflectionUtils {
+
+    public static List<Field> getFieldsToInterpolate(Class clazz) {
+        List<Field> fields = new ArrayList<Field>();
+        for(Field f : clazz.getDeclaredFields()) {
+            if(f.isAnnotationPresent(Interpolate.class)) fields.add(f);
+        }
+
+        if(clazz.getSuperclass() != Object.class) {
+            fields.addAll(getFieldsToInterpolate(clazz.getSuperclass()));
+        }
+
+        return fields;
+    }
+
+}