Fixed CVEs in vim: CVE-2022-2183, CVE-2022-2182, CVE-2022-2207, CVE-2022-2210

CVE-2022-2182: when on line zero check the column is valid for line one - CVE-2022-2183: avoid going over the NUL at the end of the line - CVE-2022-2207: check the cursor column is more than zero - CVE-2022-2210: use zero offset when change removes all lines in a diff block...