Implementing Blitz mechanic (WIP) (#8835)

* added blitz mechanic (mostly copy/paste of dash)

* renamed class

* reworked alt cost abilities, greatly reduced redundant code

* updated text generation

* removed all skips

* added test for blitz

* changed blitz implementation

* [SNC] Implemented Tenacious Underdog

Mage/src/main/java/mage/abilities/costs/AlternativeCost.java

@@ -0,0 +1,64 @@
+
+package mage.abilities.costs;
+
+import mage.game.Game;
+
+/**
+ * Virtual alternative cost, it must be tranformed to simple cost on activate in your
+ * custom ability (see askToActivateAlternativeCosts). Example: DashAbility
+ *
+ * @author LevelX2
+ */
+public interface AlternativeCost extends Cost {
+
+    String getName();
+
+    /**
+     * Returns the complete text for the alternate cost or if onlyCost is true
+     * only the pure text fore the included native cost
+     *
+     * @param onlyCost
+     * @return
+     */
+    String getText(boolean onlyCost);
+
+    /**
+     * Returns a reminder text, if the cost has one
+     *
+     * @return
+     */
+    String getReminderText();
+
+    /**
+     * Returns a text suffix for the game log, that can be added to
+     * the cast message.
+     *
+     * @param position - if there are multiple costs, it's the postion the cost is set (starting with 0)
+     * @return
+     */
+    String getCastSuffixMessage(int position);
+
+
+    /**
+     * If the player intends to pay the alternate cost, the cost will be activated
+     */
+    void activate();
+
+    /**
+     * Reset the activate
+     */
+    void reset();
+
+    /**
+     * Returns if the cost was activated
+     *
+     * @param game
+     * @return
+     */
+    boolean isActivated(Game game);
+
+    Cost getCost();
+
+    @Override
+    AlternativeCost copy();
+}