CLSA-2024-1705077885 Fix of 8 CVEs

SECURITY UPDATE: use-after-free in winclose - debian/patches/CVE-2023-48231.patch: check window is valid, before accessing it - CVE-2023-48231 SECURITY UPDATE: overflow with count for :s command - debian/patches/CVE-2023-48233.patch: abort the :s command if the count is too large - CVE-2023-48233...