Start migrating text over to new args system

Almost there. It's working fine with the sample, but next it's time to write validators to get all this arg logic out of text.rb and make it just about drawing text.

Yes, unit tests aren't updated yet.
[skip ci]

samples/text_options.rb

@@ -82,6 +82,10 @@ Squib::Deck.new(width: 825, height: 1125, cards: 3) do
        color: :green, stroke_width: 2.0, stroke_color: :blue,
        x: '1.8in', y: '3in', width: '0.85in', font: 'Sans Bold 26', markup: true
 
+  text str: "Dotted",
+       color: :white, stroke_width: 2.0, dash: '4 2', stroke_color: :black,
+       x: '1.8in', y: '3.1in', width: '0.85in', font: 'Sans Bold 28', markup: true
+
   text str: "<b>Markup</b> is <i>quite</i> <s>'easy'</s> <span fgcolor=\"\#ff0000\">awesome</span>. Can't beat those \"smart\" 'quotes', now with 10--20% more en-dashes --- and em-dashes --- with explicit ellipses too...",
        markup: true,
        x: 50, y: 1000,