Remove duplicate code for X costs (#12551)

* Replace "([a-zA-Z]+).getManaCostsToPay().getX()" with CardUtil.getSourceCostsTag(game, $1, "X", 0)
Fix Disrupting Shoal

* Change final card .getX() calls

* Condense all ManacostVariableValue enum values into "instance"

* Further removal of getX, Display X symbol for non-mana X cards

* Fix test

* Fully remove ManaCosts.getX

* Replace all different X dynamic values with GetXValue

* Remove individual cards checking getAmount for X values (leaving cost reduction that does not use X)

* Add null check for game object inside getSourceCostsTagsMap

* fix build errors

* fix Vicious Betrayal

* text fix

Mage/src/main/java/mage/abilities/AbilityImpl.java

@@ -272,7 +272,7 @@ public abstract class AbilityImpl implements Ability {
         // For Flashback ability can be set X before, so the X costs have to be restored for the flashbacked ability
         if (noMana) {
             if (!this.getManaCostsToPay().getVariableCosts().isEmpty()) {
-                int xValue = this.getManaCostsToPay().getX();
+                int xValue = CardUtil.getSourceCostsTag(game, this, "X", 0);
                 this.clearManaCostsToPay();
                 VariableManaCost xCosts = new VariableManaCost(VariableCostType.ADDITIONAL);
                 // no x events - rules from Unbound Flourishing:
@@ -438,7 +438,7 @@ public abstract class AbilityImpl implements Ability {
             game.informPlayers(announceString);
         }
         if (variableManaCost != null) {
-            int xValue = getManaCostsToPay().getX();
+            int xValue = CardUtil.getSourceCostsTag(game, this, "X", 0);
             game.informPlayers(controller.getLogName() + " announces a value of " + xValue + " for " + variableManaCost.getText()
                     + CardUtil.getSourceLogName(game, this));
         }