clean up a slight jitter when drawing circles

Dependencies

• [2] R3XGABER chunk up some long lines
• [3] KTZQ57HV replace globals with args in a few functions
• [4] JFFUF5AL override mouse state lookups in tests
• [5] NYQ7HD4D move
• [*] BLWAYPKV extract a module

Change contents

• edit in drawing.lua at line 194
  [3.3637]

  [2.2059]
  + local r = round(geom.dist(center.x, center.y, mx, my))
• replacement in drawing.lua at line 196
  [2.2104]→[3.2114:2201](∅→∅),[3.5163]→[3.2114:2201](∅→∅),[3.3715]→[3.2114:2201](∅→∅)
  − love.graphics.circle('line', cx,cy, geom.dist(cx,cy, App.mouse_x(),App.mouse_y()))
  [2.2104]

  [3.3810]
  + love.graphics.circle('line', cx,cy, Drawing.pixels(r, width))