log_merger 0.3.0

UI changes

• "f", "n", "p" key bindings - Find/Next/Prev (case-insensitive text search)
• "l" key binding - Go to line number
• "t" key binding - Go to timestamp
• "h" key binding - Show help/about info

Command line options

• --timestamp_format command line option to define a custom timestamp format template,
  for parsing log files with formats that do not begin with a leading timestamp

Log file processing

• strip escape sequences from log file lines, for consistent text alignment in columns