switch circles to 'o' to avoid conflicting with copy

Dependencies

• [2] HOSPP2AN crisp font rendering
• [3] VHQCNMAR several more modules
• [4] 2MA33THZ few more transitions between shapes
• [5] WTDKUACN rectangle and square shapes
• [6] DXT4QTAH a few more integer coordinates
• [7] XNFTJHC4 split keyboard handling between Text and Drawing
• [*] BLWAYPKV extract a module

Change contents

• replacement in help.lua at line 32
  [3.7841]→[2.5930:6017](∅→∅)
  − love.graphics.print("* Press 'ctrl+c' to switch to drawing circles/arcs", 16+30,y)
  [3.7841]

  [2.6017]
  + love.graphics.print("* Press 'ctrl+o' to switch to drawing circles/arcs", 16+30,y)
• replacement in help.lua at line 98
  [3.10489]→[2.8011:8093](∅→∅)
  − love.graphics.print("* Press 'c' to switch to drawing circles/arcs", 16+30,y)
  [3.10489]

  [2.8093]
  + love.graphics.print("* Press 'o' to switch to drawing circles/arcs", 16+30,y)
• replacement in drawing.lua at line 421
  [3.6992]→[3.6992:7052](∅→∅)
  − elseif chord == 'C-c' and not love.mouse.isDown('1') then
  [3.6992]

  [3.7052]
  + elseif chord == 'C-o' and not love.mouse.isDown('1') then
• replacement in drawing.lua at line 431
  [3.7608]→[3.7608:7662](∅→∅)
  − elseif love.mouse.isDown('1') and chord == 'c' then
  [3.7608]

  [3.7662]
  + elseif love.mouse.isDown('1') and chord == 'o' then