avoid some string concatenations

Dependencies

• [2] 2K2YDMFH ignore 'deleted' shapes when saving to disk
• [3] VHQCNMAR several more modules
• [4] BYG5CEMV support for naming points
• [5] AD34IX2Z couple more tests
• [6] 2XLZCWZC bugfix: rectangles and squares are now saved

Change contents

• replacement in file.lua at line 37
  [3.16169]→[3.16169:16206](∅→∅)
  − outfile:write(line.data..'\n')
  [3.16169]

  [3.16206]
  + outfile:write(line.data, '\n')
• replacement in file.lua at line 85
  [3.17287]→[3.17287:17333](∅→∅)
  − outfile:write(json.encode(shape)..'\n')
  [3.17287]

  [3.17333]
  + outfile:write(json.encode(shape), '\n')
• replacement in file.lua at line 88
  [3.17507]→[3.17507:17539](∅→∅)
  − outfile:write(line..'\n')
  [3.17507]

  [3.289]
  + outfile:write(line, '\n')
• replacement in file.lua at line 95
  [3.17771]→[3.17771:17803](∅→∅)
  − outfile:write(line..'\n')
  [3.17771]

  [3.17803]
  + outfile:write(line, '\n')
• replacement in file.lua at line 97
  [3.17842]→[3.17842:17958](∅→∅)
  − outfile:write(json.encode({mode=shape.mode, center=drawing.points[shape.center], radius=shape.radius})..'\n')
  [3.17842]

  [3.17958]
  + outfile:write(json.encode({mode=shape.mode, center=drawing.points[shape.center], radius=shape.radius}), '\n')
• replacement in file.lua at line 99
  [3.17994]→[3.17994:18168](∅→∅)
  − outfile:write(json.encode({mode=shape.mode, center=drawing.points[shape.center], radius=shape.radius, start_angle=shape.start_angle, end_angle=shape.end_angle})..'\n')
  [3.17994]

  [2.67]
  + outfile:write(json.encode({mode=shape.mode, center=drawing.points[shape.center], radius=shape.radius, start_angle=shape.start_angle, end_angle=shape.end_angle}), '\n')