Intro adjustments

- Force to play when selecting "START GAME" from the Goner Setup
- Make far shorter on the First Boot, obscuring the extended Kart Krew vroom, to prevent it playing identically twice
- Prevent skipping the intro at all if Ring Cup hasn't been unlocked
    - Both for the shortened initial startup and the START GAME first encounter
- It already clears dirmenu if relevant, don't do that twice

src/d_netcmd.c

@@ -4795,9 +4795,6 @@ static void Command_Playintro_f(void)
 	if (netgame)
 		return;
 
-	if (dirmenu)
-		closefilemenu(true);
-
 	F_StartIntro();
 }
 

src/f_finale.c

@@ -303,6 +303,8 @@ static tic_t introscenetime[NUMINTROSCENES] =
 // custom intros
 void F_StartCustomCutscene(INT32 cutscenenum, boolean precutscene, boolean resetplayer);
 
+static boolean skippableallowed = true;
+
 void F_StartIntro(void)
 {
 	if (gamestate)
@@ -315,6 +317,11 @@ void F_StartIntro(void)
 		D_ClearState();
 	}
 
+	skippableallowed = (
+		gamestartchallenge >= MAXUNLOCKABLES
+		|| (gamedata && gamedata->unlocked[gamestartchallenge])
+	);
+
 	M_ClearMenus(false);
 	D_SetDeferredStartTitle(false);
 
@@ -459,7 +466,7 @@ void F_IntroTicker(void)
 
 	timetonext--;
 
-	if (D_IsDeferredStartTitle())
+	if (skippableallowed && D_IsDeferredStartTitle())
 	{
 		D_StartTitle();
 		return;
@@ -468,7 +475,10 @@ void F_IntroTicker(void)
 	if (timetonext <= 0)
 	{
 		intro_scenenum++;
-		if (intro_scenenum == NUMINTROSCENES)
+		if (intro_scenenum == (M_GameTrulyStarted()
+				? NUMINTROSCENES
+				: INTROSCENE_KREW)
+		)
 		{
 			D_StartTitle();
 			// Custom built fade to skip the to-black

src/menus/main-goner.cpp

@@ -5,6 +5,7 @@
 #include "../m_cond.h"
 #include "../r_skins.h"
 #include "../s_sound.h"
+#include "../f_finale.h"
 #include "../music.h"
 #include "../p_local.h" // P_AutoPause
 #include "../st_stuff.h" // faceprefix
@@ -1178,6 +1179,7 @@ static void M_GonerConclude(INT32 choice)
 
 	gamedata->gonerlevel = GDGONER_DONE;
 
+	F_StartIntro();
 	M_ClearMenus(true);
 	M_GonerResetText();
 }