while we're at it, undo naming points

Dependencies

• [2] 7SFHSB47 rename
• [*] OTIBCAUJ love2d scaffold
• [*] Z4XRNDTR find text
• [*] BYG5CEMV support for naming points

Change contents

• edit in main.lua at line 338
  [5.3089]

  [2.5]
  + local before = snapshot(Lines.current_drawing_index)
• edit in main.lua at line 342
  [6.319]

  [6.319]
  + record_undo_event({before=before, after=snapshot(Lines.current_drawing_index)})