refactor: Add function for streaming bay weapons

WeaponMounted.getBayWeapons() iterates through the entire bay before
returning, which isn't always necessary. It has been refactored to allow
for the stream to be used directly.

megamek/src/megamek/common/equipment/WeaponMounted.java

@@ -206,13 +206,20 @@ public void clearBayWeapons() {
         bayWeapons.clear();
     }
 
+    /**
+     * @return A stream containing the weapon mounts in the bay.
+     */
+    public Stream<WeaponMounted> streamBayWeapons() {
+        return bayWeapons.stream()
+                .map(getEntity().getWeapon)
+                .filter(Objects::nonNull);
+    }
+
     /**
      * @return All the weapon mounts in the bay.
      */
     public List<WeaponMounted> getBayWeapons() {
-        return bayWeapons.stream()
-                .map(i -> getEntity().getWeapon(i))
-                .filter(Objects::nonNull)
+        return streamBayWeapons()
                 .collect(Collectors.toList());
     }