Less version 668

Version 668 was released for beta testing on 9 Oct 2024, and was released for general use on 17 Oct 2024.

These are the differences between version 661 and version 668:

• Make 256/true colors work better on Windows without -Da (github #539, github #546, github #562).
• Fix build using --with-secure (github #544).
• Fix crash when using --header on command line (github #545).
• Fix possible crash when scrolling left/right or toggling -S (github #547).
• Fix bug when using #stop in a lesskey file (github #551).
• Fix bug when using --shift or --match-shift on command line with a parameter starting with '.' (github #554).
• Fix bug in R command when file size changes (github #553).
• Fix bug using --header when file does not fill screen (github #556).
• Fix ^X bug when output is not a terminal (github #558).
• Fix bug where ^Z is not handled immediately (github #563).
• Fix bug where first byte from a LESSOPEN filter is deleted if it is greater than 0x7F (github #568).
• Fix uninitialized variable in edit_ifile (github #573).
• Fix incorrect handling of UTF-8 chars in prompts (github #576).