couple of bugfixes to file-handling

Dependencies

• [2] Z4KNS42N to open a file without a terminal, drag it on!
• [3] YKRF5V3Z starting to load/save
• [*] OTIBCAUJ love2d scaffold

Change contents

• edit in main.lua at line 73
  [2.119]

  [5.183]
  + file:close()
• replacement in main.lua at line 816
  [2.155]→[2.155:206](∅→∅)
  − local result = load_from_file(io.open(filename))
  [2.155]

  [2.206]
  + local result = load_from_file(infile)