Support for extra card fields in stylesheets;

Fixed some bugs:
 - Missing choice images can crash mse.
 - The wrong style is used for making preview choice images on style panel.
FOR_EACH(x, *y.z) should now work without parentheses on linux as well.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@389 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/stylesheet.hpp

@@ -38,7 +38,10 @@ class StyleSheet : public Packaged {
 	/// The styling for set info fields
 	/** The indices should correspond to the set_fields in the Game */
 	IndexMap<FieldP, StyleP> set_info_style;
-	/// Extra fields for styling
+	/// Extra card fields for boxes and borders
+	vector<FieldP> extra_card_fields;
+	IndexMap<FieldP, StyleP> extra_card_style;
+	/// Extra fields for styling options
 	vector<FieldP> styling_fields;
 	/// The styling for the extra set fields
 	/** The indices should correspond to the styling_fields */