always have a filename

Dependencies

• [2] Z4KNS42N to open a file without a terminal, drag it on!
• [3] IZZVOCLB confirm that we have access to all of the love API
• [4] OTIBCAUJ love2d scaffold
• [5] JVRL5TWL store device-independent coordinates inside drawings
• [6] YKRF5V3Z starting to load/save
• [7] 2C7CTIQY make space for multiple kinds of width
• [8] W4UVZETR 2 regressions:
• [9] 2KRK3OBV don't rely on defaults

Change contents

• replacement in main.lua at line 48
  [3.4]→[3.4:19](∅→∅)
  − filename = nil
  [3.4]

  [3.47]
  + filename = 'lines.txt'
• edit in main.lua at line 63
  [3.85]→[3.85:157](∅→∅)
  − lines = load_from_disk(filename)

  − else

  − table.insert(lines, '')
• edit in main.lua at line 64
  [3.163]

  [2.2]
  + lines = load_from_disk(filename)