anchor.diff:  to work with all of the systems officially supported by golang with
   the exception of nacl (which lacks any kind of a terminal interface).
   (Plan9 is not supported by _Tcell_, but it is experimental status only
  -in golang.)  For all of these systems *except Solaris/illumos*, _Tcell_
  -is pure Go, with no need for CGO.
  +in golang.)  _Tcell_ is pure Go, without any need for CGO.
   
   ## No Async IO
   
  
positive.code: entries, so that for example attempts to emit color sequences on VT100 terminals
  won't result in unintended consequences.
  
  In Windows mode, _Tcell_ supports 16 colors, bold, dim, and reverse,
  instead of just termbox's 8 colors with reverse.  (Note that there is some
  conflation with bold/dim and colors.)
  
  _Tcell_ maps 16 colors down to 8, for terminals that need it.
  (The upper 8 colors are just brighter versions of the lower 8.)
  
negative.code: _Tcell_ supports enhanced mouse tracking mode, so your application can receive
  regular mouse motion events, and wheel events, if your terminal supports it.
  
  (Note: The Windows 10 Terminal application suffers from a flaw in this regard,
  and does not support mouse interaction.  The stock Windows 10 console host
  fired up with cmd.exe or PowerShell works fine however.)
  
  ## _Termbox_ Compatibility
  
  A compatibility layer for _termbox_ is provided in the `compat` directory.
  To use it, try importing `github.com/gdamore/tcell/termbox` instead.
  Most _termbox-go_ programs will probably work without further modification.
  
  ## Working With Unicode
  
  