log_merger 0.4.0

Added:

• (experimental) merging .pcap files (such as those created using tcpdump or Wireshark)
• --demo command line option to run simple demo
• ctrl-d to toggle light/dark mode
• more natural user interaction with text in the Help/About dialog (page up/down/home/end)
• README.md for the sample files directory
• Python 3.12 compatibility