woof this was a big change but ok

Add cell_px everywhere we have dpi

This might be smelly. Sorry, Mr. Fowler and Prof. Frens...

spec/args/box_spec.rb

@@ -55,7 +55,8 @@ describe Squib::Args::Box do
 
   context 'layouts' do
     let(:deck_of_2) do
-      OpenStruct.new(width: 123, height: 456, size: 2, layout: {
+      OpenStruct.new(width: 123, height: 456, size: 2,
+        dpi: 300, cell_px: 37.5, layout: {
         'attack' => { 'x' => 50 },
         'defend' => { 'x' => 60 },
       })
@@ -100,7 +101,7 @@ describe Squib::Args::Box do
   end
 
   context 'unit conversion' do
-    let(:deck_of_2) { OpenStruct.new(width: 123, height: 456, size: 2, dpi: 300) }
+    let(:deck_of_2) { OpenStruct.new(width: 123, height: 456, size: 2, dpi: 300, cell_px: 37.5) }
 
     it 'converts units on all args' do
       args = { x: ['1in', '2in'], y: 300, width: '1in', height: '1in' }

spec/args/draw_spec.rb

@@ -50,7 +50,7 @@ describe Squib::Args::Draw do
 
     it 'does unit conversion on dash options' do
       args = { dash: '3in  4in 5in' }
-      draw.load!(args)
+      draw.load!(args, dpi: 300)
       expect(draw).to have_attributes(dash: [[900, 1200, 1500]])
     end