the extension writes too much on the disk

[maoschanz]

the NotesButton class should be a NotesManager with object-oriented meaningful ways to track the files that exist, and read and write them individually when needed, instead of erasing and re-creating every files at each change

• object-oriented NotesManager singleton
  • no "global" functions, the world has evolved past the need for "global" functions
  • signals as an attribute
  • distinction between public and private methods
  • "all_notes" array as an attribute
• when deleting a note, (instead of restacking the whole array,) provide the removed id as an argument of NotesManager.postDelete and rename only the files of 1 note
• rewrite the spaghetti mess in noteBox.js
  • yeet the most useless methods
  • distinction between public and private methods
  • [ ] yeet the alternative headerbars and use modal dialogs maybe not a great UX
• no need to save the metadata each time, no one care if they're lost
• add a delay before saving the notes, so it freezes the computer after the notes are hidden
• ...more?