Add rotate option for save_sheet (#301) (#345)

* Initial work on rotate for save_sheet

* Feature done! Maybe?

samples/saves/_saves.rb

@@ -1,4 +1,5 @@
-require 'squib'
+# require 'squib'
+require_relative '../../lib/squib'
 
 # This sample demonstrates how to use the various save methods
 
@@ -60,3 +61,14 @@ Squib::Deck.new(width: 100, height: 100, cards: 3) do
   # Buggy behavior was to revert to 1 row and not respect the rows arg.
   save_sheet prefix: 'save_sheet_bug332_', rows: 2, columns: 4
 end
+
+# Allow rotating
+Squib::Deck.new(width: 100, height: 50, cards: 8) do
+  background color: :white
+  rect x: 10, y: 10, width: 80, height: 30
+  rect x: 5, y: 5, width: 90, height: 40, stroke_width: 5, stroke_color: :blue
+  text y: 2, str: 0..7, font: 'Open Sans Bold 8', align: :center, width: 100
+  save_sheet prefix: 'save_sheet_rotated_', rows: 2, columns: 3, rotate: true
+  save_sheet prefix: 'save_sheet_rotated_trimmed_', rows: 2, columns: 3, rotate: true, trim: 5
+  save_sheet prefix: 'save_sheet_rotated_trimmed_rtl_', rows: 2, columns: 3, rotate: true, trim: 5, rtl: true
+end