logmerger v0.9.0

• Added "s" key binding to capture a screenshot of the current screen.
• Support for strace log files; added "strace" custom timestamp format, which also accepts leading process id integer on each line.
• --autoclip command-line option, to clip merged output to the first and last timestamps found in the first log file.
• --show_clock command-line option, to show a running clock in the header of the interactive merged log display.
• Added SECURITY.md and security vulnerability reporting guidance in README.md.
• Added Python 3.13 support.