card_fields rewrite and magic-modules.mse-include (#21)

Overhauls the card_fields file to allow for template designers more freedom in manipulating data.

Adds magic-modules.mse-include, a large scale include file for building templates in a standardized way. Applying this to existing frames will be coming in future updates.

data/magic-new-doublefaced-sparker.mse-style/style

@@ -77,7 +77,23 @@ init script:
 	}
 	
 	card_shape := {"double faced planeswalker"}
-
+	faces_coordinates := {
+		[
+			[
+				left: 0,
+				top: 0,
+				width: 375,
+				height: 523
+			],
+			[
+				left: 377,
+				top: 0,
+				width: 375,
+				height: 523
+			]
+		]
+	}
+	
 	typesymbol_for :=
 		to_text +
 		replace@(match: "(Legendary|Basic|Snow|World| )", replace: "") +