Added passengers (plural) mec & flag for 1.11.2

In reference to my earlier feature request:
#1627

Made new mec & tag instead of editing old ones to preserve backwards compatibility, plus they work differently than the old ones. Tested both old and new features on 1.12, 1.11.2, and 1.10. All are working~

plugin/src/main/java/net/aufdemrand/denizen/objects/dEntity.java

@@ -1970,6 +1970,24 @@ else if (mtr.angle == BlockFace.EAST) {
             }
         }
 
+        // <--[tag]
+        // @attribute <e@entity.passengers>
+        // @returns dList(dEntity)
+        // @group attributes
+        // @description
+        // Returns a list of the entity's passengers, if any.
+        // -->
+        if (NMSHandler.getVersion().isAtLeast(NMSVersion.v1_11_R1) && (attribute.startsWith("passengers") || attribute.startsWith("get_passengers"))) {
+            if (!entity.isEmpty()) {
+                ArrayList<dEntity> passengers = new ArrayList<dEntity>();
+                for (Entity ent : entity.getPassengers()) {
+                        passengers.add(new dEntity(ent));
+                }
+                return new dList(passengers)
+                        .getAttribute(attribute.fulfill(1));
+            }
+        }
+
         // <--[tag]
         // @attribute <e@entity.passenger>
         // @returns dEntity
@@ -2635,6 +2653,25 @@ public void adjust(Mechanism mechanism) {
             NMSHandler.getInstance().getEntityHelper().setBreeding((Animals) getLivingEntity(), value.asBoolean());
         }
 
+        // <--[mechanism]
+        // @object dEntity
+        // @name passengers
+        // @input dList(dEntity)
+        // @description
+        // Sets the passengers of this entity.
+        // @tags
+        // <e@entity.passengers>
+        // <e@entity.empty>
+        // -->
+        if (NMSHandler.getVersion().isAtLeast(NMSVersion.v1_11_R1) && mechanism.matches("passengers")) {
+            entity.eject();
+            for (dEntity ent : value.asType(dList.class).filter(dEntity.class)) {
+                if (ent.isSpawned()) {
+                    entity.addPassenger(ent.getBukkitEntity());
+                }
+            }
+        }
+
         // <--[mechanism]
         // @object dEntity
         // @name passenger