Devotion mechanics (thanks to excessum for patch)

+ some refactoring:
extrManaCost --> ExtraManaCost
unattachCost --> UnattachCost

projects/mtg/include/ManaCostHybrid.h

@@ -18,6 +18,7 @@ public:
     int hasColor(int color);
     string toString();
     int getConvertedCost();
+    int getManaSymbols(int color);
     
     friend std::ostream& operator<<(std::ostream& out, ManaCostHybrid& m);
     friend std::ostream& operator<<(std::ostream& out, ManaCostHybrid* m);