Fizzle unless pay x (thanks to excessum)

- saves source card in storedSourceCard for ATransform
- adds support for WParsedInt in pay as "pay[[{value:WParsedInt}]]":

name=Spell Rupture
target=*|stack
auto=if cantargetcard(*|opponentstack) then transforms((,newability[pay[[{value:power:highest:creature:opponentbattlefield}]] name(pay {value} mana) donothing?fizzle])) forever
text=Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.
mana={1}{U}
type=Instant

- adds support for {x} in *some* “pay” abilities (Syncopate):

name=Syncopate
target=*|stack
auto=transforms((,newability[pay[[{x}]] name(pay {value} mana) donothing?fizzleto(exile)])) forever
text=Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into  its owner's graveyard.
mana={X}{U}
type=Instant

- support of "name(pay {value} mana)" in pay abilities to show actual number to pay (see example above)

projects/mtg/src/ManaCost.cpp

@@ -7,6 +7,7 @@
 #include "Player.h"
 #include "WEvent.h"
 #include "MTGAbility.h"
+#include "AllAbilities.h"
 #include "iterator"
 
 SUPPORT_OBJECT_ANALYTICS(ManaCost)
@@ -119,6 +120,14 @@ ManaCost * ManaCost::parseManaCost(string s, ManaCost * _manaCost, MTGCardInstan
                             }
                         }
                         break;
+                    case 'v':
+                        if (value.find("value:") != string::npos) {
+                            vector<string> splitParsedVar = parseBetween(value, "value:", " ", false);
+                            WParsedInt* res = NEW WParsedInt(splitParsedVar[1], NULL, c);
+                            manaCost->add(Constants::MTG_COLOR_ARTIFACT, res->getValue());
+                            SAFE_DELETE(res);
+                        }
+                        break;
                     case 't': //Tap
                         if (value == "t")
                         {