Less version 643

Version 643 was released for beta testing on 22 Jul 2023.

These are the differences between version 633 and version 643:

• Fix problem when a program piping into less reads from the tty, like sudo asking for password (github #368).
• Fix search modifier ^E after ^W.
• Fix bug using negated (^N) search (github #374).
• Fix bug setting colors with -D on Windows build (github #386).
• Fix reading special chars like PageDown on Windows (github #378).
• Fix mouse wheel scrolling on Windows (github #379).
• Fix erroneous EOF when terminal window size changes (github #372).
• Fix compile error with some definitions of ECHONL (github #395).
• Fix crash on Windows when writing logfile (github #405).
• Fix regression in exit code when stdin is /dev/null and output is a file (github #373).
• Add lesstest test suite to production release (github #344).
• Change lesstest output to conform with automake Simple Test Format (github #399).