ugh, handle absolute as well as relative paths

Dependencies

• [2] WOXIYUTL bugfix: manage screen_top and cursor when resizing
• [3] DWZK32YD include CWD when saving filename
• [4] 7M7LS7I2 start saving some settings to disk on quit
• [*] OTIBCAUJ love2d scaffold
• [*] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing

Change contents

• edit in main.lua at line 321
  [4.135]

  [4.135]
  + local filename = Filename

  + if filename:sub(1,1) ~= '/' then

  + filename = love.filesystem.getWorkingDirectory()..'/'..filename -- '/' should work even on Windows

  + end
• replacement in main.lua at line 329
  [3.37]→[3.37:140](∅→∅)
  − filename=love.filesystem.getWorkingDirectory()..'/'..Filename, -- '/' should work even on Windows
  [3.37]

  [3.140]
  + filename=filename,
• edit in Manual_tests.md at line 26
  [2.1589]
  +

  + ### Todo list

  +

  + * Initializing settings:

  + - from previous session

  + - Filename as absolute path

  + - Filename as relative path

  + - from defaults