1.4.3 release

• Add basic markdown support
• Add !! command to execute system commands without reading their output. Useful for running programs with terminal UI (e.g. vim)
• Allow multistr_c elements be more than one wchar_t in length (allows for multi-character separators, basically)
• Rework colors
  • Initialize all color pairs on startup (17 * 17 color pairs), set colors through specifying its pair index (pair_index = fg_col + 1 + (bg_col + 1) * 17, fg_col and bg_col are integers from -1 to 15)
  • Remove colors.bg and colors.status_standout cvars
• Support color switching with terminal sequences (^[[3*;4*m)
• Specify status fields in cvars left-to-right instead of right-to-left
• Add manpage generation, show only relevant (well...) help in program
• Fix unnamed lists sometimes not displaying in LISTVIEW even if they had visible entries
• Fix DETAILS and HELP mode scrolling and do an overall reworking of some UI code