stop recording points for arcs

Dependencies

• [2] LAW2O3NW extract variable Margin_left
• [3] OWK3U6VD tests for drawing polygons
• [4] CRYGI3LR more drawing tests
• [5] DRFE3B3Z mouse buttons are integers, not strings
• [6] WSXSEZQ2 switch circles to 'o' to avoid conflicting with copy
• [7] JFFUF5AL override mouse state lookups in tests
• [8] XNFTJHC4 split keyboard handling between Text and Drawing
• [*] K2X6G75Z start writing some tests for drawings
• [*] BLWAYPKV extract a module

Change contents

• replacement in drawing_tests.lua at line 179
  [3.619]→[3.619:679](∅→∅)
  − check_eq(#drawing.points, 2, 'F - test_draw_arc/#points')
  [3.619]

  [4.6918]
  + check_eq(#drawing.points, 1, 'F - test_draw_arc/#points')
• edit in drawing.lua at line 432
  [4.3451]→[4.7356:7414](∅→∅),[2.5076]→[4.7356:7414](∅→∅),[4.7356]→[4.7356:7414](∅→∅)
  − local j = Drawing.insert_point(drawing.points, mx,my)