snap lines to nearby points

Dependencies

• [2] IFGAJAF7 add a level of indirection to vertices of shapes
• [3] EFMLTMZG bugfix: restrict strokes to the drawing they started in
• [4] JCSLDGAH beginnings of support for multiple shapes
• [*] OTIBCAUJ love2d scaffold

Change contents

• edit in main.lua at line 174
  [2.797]

  [2.797]
  + local px,py = pixels(x),pixels(y)
• replacement in main.lua at line 176
  [2.832]→[2.832:874](∅→∅)
  − if point.x == x and point.y == y then
  [2.832]

  [2.874]
  + local cx,cy = pixels(point.x), pixels(point.y)

  + if (cx-px)*(cx-px) + (cy-py)*(cy-py) < 16 then