Implement Prototype ability (#11249)

Prototype is a SpellAbilityType, for which alternate costs are permitted. It has a continuous effect that applies on the battlefield as well as a method to modify the spell on the stack. Permanents have an isPrototyped flag that copy effects can check explicitly (same brittle method as transformed permanents use; reworking copy effects to streamline them is a separate scope).

Many test cases have been added to confirm functionality (thanks to Zerris for additional test suggestions).

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Co-authored-by: Susucre <34709007+Susucre@users.noreply.github.com>
Co-authored-by: Evan Kranzler <theelk801@gmail.com>
Co-authored-by: xenohedron <xenohedron@users.noreply.github.com>

Mage/src/main/java/mage/MageObjectImpl.java

@@ -281,6 +281,11 @@ public abstract class MageObjectImpl implements MageObject {
         return manaCost;
     }
 
+    @Override
+    public void setManaCost(ManaCosts<ManaCost> costs) {
+        this.manaCost = costs.copy();
+    }
+
     @Override
     public int getManaValue() {
         if (manaCost != null) {