Fix of CVE: CVE-2022-0413, CVE-2022-0417, CVE-2022-0408, CVE-2022-0443

CVE-2022-0408: fix stack corruption when looking for spell suggestions - CVE-2022-0413: fix using freed memory when substitute with function call - CVE-2022-0417: fix illegal memory access caused by ':retab 0' - CVE-2022-0443: fix using freed memory with ':lopen' and ':bwipe'...