Scripts/Commands: mod xp command

Closes #13476

src/server/scripts/Commands/cs_modify.cpp

@@ -70,6 +70,7 @@ public:
             { "spell",        rbac::RBAC_PERM_COMMAND_MODIFY_SPELL,        false, &HandleModifySpellCommand,         "", NULL },
             { "standstate",   rbac::RBAC_PERM_COMMAND_MODIFY_STANDSTATE,   false, &HandleModifyStandStateCommand,    "", NULL },
             { "talentpoints", rbac::RBAC_PERM_COMMAND_MODIFY_TALENTPOINTS, false, &HandleModifyTalentCommand,        "", NULL },
+            { "xp",           rbac::RBAC_PERM_COMMAND_MODIFY_XP,           false, &HandleModifyXPCommand,            "", NULL },
             { NULL,           0,                                     false, NULL,                              "", NULL }
         };
         static ChatCommand commandTable[] =
@@ -1393,6 +1394,37 @@ public:
 
         return true;
     }
+
+    // mod xp command
+    static bool HandleModifyXPCommand(ChatHandler *handler, const char* args)
+    {
+        if (!*args)
+            return false;
+
+        int32 xp = atoi((char*)args);
+
+        if (xp < 1)
+        {
+            handler->SendSysMessage(LANG_BAD_VALUE);
+            handler->SetSentErrorMessage(true);
+            return false;
+        }
+
+        Player* target = handler->getSelectedPlayerOrSelf();
+        if (!target)
+        {
+            handler->SendSysMessage(LANG_NO_CHAR_SELECTED);
+            handler->SetSentErrorMessage(true);
+            return false;
+        }
+
+        if (handler->HasLowerSecurity(target, ObjectGuid::Empty))
+            return false;
+
+        // we can run the command
+        target->GiveXP(xp, nullptr);
+        return true;
+    }
 };
 
 void AddSC_modify_commandscript()