Sprues for DriveThruCards and printplaygames (#247)

* Correct links (duped save_sheet) and grammar.

* Create a sprue for https://www.drivethrucards.com/

* Create a sprue for printplaygames.com poker cards.

lib/squib/builtin/sprues/drivethrucards_1up.yml

@@ -0,0 +1,10 @@
+--- # Cards laid out for https://www.drivethrucards.com/
+# Make sure the cards being saved alternate back/front, back/front.
+# save_pdf sprue: 'drivethrucards_1up.yml', file: 'dtc_output.pdf'
+sheet_width: 2.75in
+sheet_height: 3.75in
+card_width: 2.75in
+card_height: 3.75in
+cards:
+- x: 0.0in
+  y: 0.0in

lib/squib/builtin/sprues/printplaygames_18up.yml

@@ -0,0 +1,68 @@
+--- # Cards laid out for https://www.printplaygames.com/product/poker-cards
+# Make sure the range is alternating 18 fronts / 18 backs.
+# save_pdf sprue: 'printplaygames_18up.yml', file: 'pnp_output.pdf'
+sheet_width: 12.0in
+sheet_height: 18.0in
+card_width: 2.75in
+card_height: 3.75in
+position_reference: :center
+cards:
+  # Column 1
+- x: 2.3in
+  y: 2.165in
+  rotate: :counterclockwise
+- x: 2.3in
+  y: 4.915in
+  rotate: :counterclockwise
+- x: 2.3in
+  y: 7.665in
+  rotate: :counterclockwise
+- x: 2.3in
+  y: 10.415in
+  rotate: :counterclockwise
+- x: 2.3in
+  y: 13.165in
+  rotate: :counterclockwise
+- x: 2.3in
+  y: 15.915in
+  rotate: :counterclockwise
+
+  # Column 2
+- x: 6in
+  y: 2.165in
+  rotate: :counterclockwise
+- x: 6in
+  y: 4.915in
+  rotate: :counterclockwise
+- x: 6in
+  y: 7.665in
+  rotate: :counterclockwise
+- x: 6in
+  y: 10.415in
+  rotate: :counterclockwise
+- x: 6in
+  y: 13.165in
+  rotate: :counterclockwise
+- x: 6in
+  y: 15.915in
+  rotate: :counterclockwise
+
+  # Column 3
+- x: 9.7in
+  y: 2.165in
+  rotate: :counterclockwise
+- x: 9.7in
+  y: 4.915in
+  rotate: :counterclockwise
+- x: 9.7in
+  y: 7.665in
+  rotate: :counterclockwise
+- x: 9.7in
+  y: 10.415in
+  rotate: :counterclockwise
+- x: 9.7in
+  y: 13.165in
+  rotate: :counterclockwise
+- x: 9.7in
+  y: 15.915in
+  rotate: :counterclockwise