Allow challenges to be ended via the script.

src/battle/script.c

@@ -165,6 +165,10 @@ static void executeNextLine(ScriptRunner *runner)
 		addHudMessage(colors.red, _("Mission Failed!"));
 		failMission();
 	}
+	else if (strcmp(command, "END_CHALLENGE") == 0)
+	{
+		game.currentMission->challengeData.scriptedEnd = 1;
+	}
 	else if (strcmp(command, "RETREAT_ALLIES") == 0)
 	{
 		battle.isEpic = 0;

src/battle/script.h

@@ -37,3 +37,4 @@ extern char *getTranslatedString(char *string);
 
 extern Battle battle;
 extern Colors colors;
+extern Game game;

src/structs.h

@@ -254,6 +254,7 @@ typedef struct {
 	int noBoost;
 	int noECM;
 	int noGuns;
+	int scriptedEnd;
 	Challenge *challenges[MAX_CHALLENGES];
 } ChallengeData;