always show current filename in window title

Dependencies

• [2] 5T2E3PDV couple of bugfixes to file-handling
• [3] QCQHLMST always have a filename
• [4] 2C7CTIQY make space for multiple kinds of width
• [5] 2FBLO5FH adjust window size
• [6] 2KRK3OBV don't rely on defaults
• [7] W4UVZETR 2 regressions:
• [*] OTIBCAUJ love2d scaffold
• [*] Z4KNS42N to open a file without a terminal, drag it on!

Change contents

• replacement in main.lua at line 58
  [4.166]→[4.166:208](∅→∅)
  − love.window.setTitle("Text with Lines")
  [4.166]

  [4.2]
  + love.window.setTitle('Text with Lines')
• edit in main.lua at line 65
  [3.60]

  [10.2]
  + love.window.setTitle('Text with Lines - '..filename)
• edit in main.lua at line 73
  [2.16]

  [9.183]
  + love.window.setTitle('Text with Lines - '..filename)