bugfix: rectangles and squares are now saved

Dependencies

• [2] SVJZZDC3 snapshot - no, that's all wrong
• [3] VHQCNMAR several more modules
• [*] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing

Change contents

• edit in manual_tests at line 29
  [2.1809]
  +

  + persistence:

  + draw a line, circle, rectangle, square, polygon, quit, restart. All the shapes you drew should still be visible.
• replacement in file.lua at line 54
  [3.16742]→[3.16742:16782](∅→∅)
  − elseif shape.mode == 'polygon' then
  [3.16742]

  [3.16782]
  + elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then
• edit in file.lua at line 60
  [3.17060]

  [3.17060]
  + else

  + print(shape.mode)

  + assert(false)
• replacement in file.lua at line 77
  [3.17539]→[3.17539:17579](∅→∅)
  − elseif shape.mode == 'polygon' then
  [3.17539]

  [3.17579]
  + elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then
• edit in file.lua at line 88
  [3.18168]

  [3.18168]
  + else

  + print(shape.mode)

  + assert(false)