SPIGOT-5380, SPIGOT-6958, #772: Add some missing entity API

By: Ollie <69084614+olijeffers0n@users.noreply.github.com>

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

@@ -5,7 +5,7 @@ import org.jetbrains.annotations.NotNull;
 /**
  * Panda entity.
  */
-public interface Panda extends Animals {
+public interface Panda extends Animals, Sittable {
 
     /**
      * Gets this Panda's main gene.
@@ -37,6 +37,76 @@ public interface Panda extends Animals {
      */
     void setHiddenGene(@NotNull Gene gene);
 
+    /**
+     * Gets whether the Panda is rolling
+     *
+     * @return Whether the Panda is rolling
+     */
+    boolean isRolling();
+
+    /**
+     * Sets whether the Panda is rolling
+     *
+     * @param flag Whether the Panda is rolling
+     */
+    void setRolling(boolean flag);
+
+    /**
+     * Gets whether the Panda is sneezing
+     *
+     * @return Whether the Panda is sneezing
+     */
+    boolean isSneezing();
+
+    /**
+     * Sets whether the Panda is sneezing
+     *
+     * @param flag Whether the Panda is sneezing
+     */
+    void setSneezing(boolean flag);
+
+    /**
+     * Gets whether the Panda is on its back
+     *
+     * @return Whether the Panda is on its back
+     */
+    boolean isOnBack();
+
+    /**
+     * Sets whether the Panda is on its back
+     *
+     * @param flag Whether the Panda is on its back
+     */
+    void setOnBack(boolean flag);
+
+    /**
+     * Gets whether the Panda is eating
+     *
+     * @return Whether the Panda is eating
+     */
+    boolean isEating();
+
+    /**
+     * Sets the Panda's eating status. The panda must be holding food for this to work
+     *
+     * @param flag Whether the Panda is eating
+     */
+    void setEating(boolean flag);
+
+    /**
+     * Gets whether the Panda is scared
+     *
+     * @return Whether the Panda is scared
+     */
+    boolean isScared();
+
+    /**
+     * Gets how many ticks the panda will be unhappy for
+     *
+     * @return The number of ticks the panda will be unhappy for
+     */
+    int getUnhappyTicks();
+
     public enum Gene {
 
         NORMAL(false),