v0.1.0

Added

• Two-column key-value formatting with batslib_print_kv_single()
• Multi-line key-value formatting with batslib_print_kv_multi()
• Mixed formatting with batslib_print_kv_single_or_multi()
• Header and footer decoration with batslib_decorate()
• Prefixing lines with batslib_prefix()
• Marking lines with batslib_mark()
• Common output function batslib_err()
• Line counting with batslib_count_lines()
• Checking whether a text is one line long with
  batslib_is_single_line()
• Determining key width for two-column and mixed formatting with
  batslib_get_max_single_line_key_width()