Revert "Added callback line of sight methods. Thanks xZise!"

This reverts commit 1df3a823ba477d68b359e5ac246345a05fe82ebd.

By: EvilSeph <evilseph@gmail.com>

paper-api/src/main/java/org/bukkit/util/Callback.java

@@ -1,19 +0,0 @@
-package org.bukkit.util;
-
-/**
- * Primitive callback class, to allow specific callback handling. For example to determine if a block in sight is invisible.
- *
- * @param <Result> This is the type it will return.
- * @param <Parameter> This is the type it has as parameter.
- */
-public interface Callback<Result, Parameter> {
-
-    /**
-     * This method will be called on each step.
-     *
-     * @param parameter The parameter of this step.
-     * @return The result of the step.
-     */
-    public Result call(Parameter parameter);
-
-}

paper-api/src/main/java/org/bukkit/util/TransparentCallback.java

@@ -1,34 +0,0 @@
-package org.bukkit.util;
-
-import java.util.Set;
-
-import org.bukkit.block.Block;
-
-/**
- * Default transparent call back. This class as callback acts like the normal
- * line of sight methods.
- *
- * To implement own handler override {@link TransparentCallback#call(Block)} and
- * call it via super.
- */
-public class TransparentCallback implements Callback<Boolean, Block> {
-
-    private final Set<Byte> transparent;
-
-    /**
-     * Creates a new callback class which returns by default for every block in
-     * the transparent list true. Otherwise false. Could be expanded by override
-     * the {@link Callback#call(Block)} method.
-     *
-     * @param transparent
-     *            The list of transparent blocks.
-     */
-    public TransparentCallback(Set<Byte> transparent) {
-        this.transparent = transparent;
-    }
-
-    public Boolean call(Block parameter) {
-        return this.transparent.contains((byte) parameter.getTypeId());
-    }
-
-}