Add new class natives

Adding ZR_GetHumanClass and ZR_GetZombieClass natives to expose external plugins to more than just the clients active class.

src/include/zr/class.zr.inc

@@ -63,6 +63,24 @@ native bool:ZR_IsValidClassIndex(classIndex);
  */
 native bool:ZR_GetActiveClass(client);
 
+/**
+ * Gets the current human class index that the player is using.
+ *
+ * @param client    The client index.
+ *
+ * @return          The human class index.
+ */
+native bool:ZR_GetHumanClass(client);
+
+/**
+ * Gets the current zombie class index that the player is using.
+ *
+ * @param client    The client index.
+ *
+ * @return          The zombie class index.
+ */
+native bool:ZR_GetZombieClass(client);
+
 /**
  * Selects a class for a player.
  *