MacVim defaults clean up and modernization

Just a general issue for improving the defaults for what I consider to be what constitutes a modern GUI text editor. Changing defaults is always contentious, and therefore should require a bit of thoughts behind them. None of the proposed defaults below change any features and they would just require either a vimrc change or changing them in the user settings. Just listing them below to keep track of and to gather feedbacks:

• set macligatures
• MMShareFindPboard should be NO.
• Overlay scroll bar (once implemented)
• set guifont=-monospace-

Implemented:

• #1528
  • Smooth resizing defaults to on (feature originally implemented in #1276)
  • set guioption+=k

Update: I have made a comment for each of the new option in case people want to vote on them using emoji reactions. (Per suggested by a comment)

Revisa los valores predeterminados propuestos en este issue, incluidos macligatures, MMShareFindPboard, las barras de desplazamiento superpuestas y guifont, junto con los cambios ya implementados en #1528. Comprueba primero la discusión enlazada y los comentarios con emojis; el trabajo solo estará completo cuando el proyecto llegue a una decisión sobre qué valores predeterminados cambiar y dónde corresponde cada cambio.