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)

この issue で提案されているデフォルト値（macligatures、MMShareFindPboard、オーバーレイスクロールバー、guifont を含む）と、#1528 ですでに実装されている変更を確認してください。まずリンク先の議論と絵文字によるフィードバックを確認してください。プロジェクトがどのデフォルト値を変更するか、また各変更をどこに配置するかについて決定に達して初めて、作業は完了です。