SPIGOT-1571: Add Entity Glide Events.

By: 0x277F <0x277F@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java

@@ -474,6 +474,16 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return true;
     }
 
+    @Override
+    public boolean isGliding() {
+        return getHandle().getFlag(7);
+    }
+
+    @Override
+    public void setGliding(boolean gliding) {
+        getHandle().setFlag(7, gliding);
+    }
+
     @Deprecated
     public int _INVALID_getLastDamage() {
         return NumberConversions.ceil(getLastDamage());

paper-server/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -984,4 +984,10 @@ public class CraftEventFactory {
         event.getInventory().setItem(2, event.getResult());
         return event;
     }
+
+    public static EntityToggleGlideEvent callToggleGlideEvent(EntityLiving entity, boolean gliding) {
+        EntityToggleGlideEvent event = new EntityToggleGlideEvent((LivingEntity) entity.getBukkitEntity(), gliding);
+        entity.world.getServer().getPluginManager().callEvent(event);
+        return event;
+    }
 }