SPIGOT-4705: Revamp Ageable interface and add Breedable interface

By: Shane Bee <shanebolenback@me.com>

paper-api/src/main/java/org/bukkit/entity/Breedable.java

@@ -0,0 +1,38 @@
+package org.bukkit.entity;
+
+/**
+ * Represents an entity that can age and breed.
+ */
+public interface Breedable extends Ageable {
+
+    /**
+     * Lock the age of the animal, setting this will prevent the animal from
+     * maturing or getting ready for mating.
+     *
+     * @param lock new lock
+     */
+    public void setAgeLock(boolean lock);
+
+    /**
+     * Gets the current agelock.
+     *
+     * @return the current agelock
+     */
+    public boolean getAgeLock();
+
+    /**
+     * Return the ability to breed of the animal.
+     *
+     * @return the ability to breed of the animal
+     */
+    public boolean canBreed();
+
+    /**
+     * Set breedability of the animal, if the animal is a baby and set to
+     * breed it will instantly grow up.
+     *
+     * @param breed breedability of the animal
+     */
+    public void setBreed(boolean breed);
+
+}