fix: macOS related bugs

[vitonsky]

Closes #97

• Problem with copy/paste is fixed via app menu
• When user open context menu on tabs its text no more selects. We prevent default behaviour
• Checkboxes did not worked in old electron version. I don't know why. Once electron version has been updated, this bug is fixed automatically. But anyway I also has update a lexical package. In new electron version extensions does not work.
• The problem with dock is fixed. Now window do not closes when window is hidden by another window
• In editor toolbar implemented instant actions approach. Now click by header insert header immediately. In case user want to pick another option, they may open context menu
• Implemented graceful shutdown on macOS for close app via Ctrl+C