Added clone() function to Value.

Added support for per-card styling

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@430 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/field/symbol.hpp

@@ -69,6 +69,7 @@ class SymbolValue : public Value {
 	ValueType filename;    ///< Filename of the symbol (in the current package)
 	Age       last_update; ///< When was the symbol last changed?
 	
+	virtual ValueP clone() const;
 	virtual String toString() const;
 	
   private: