Fixup respawning logic and remove softlocktimer

* Fix respawning at 0,0,0 if you cross the finish line without touching the
  ground and dying (on waypoint maps)
* Fix a broken lap check making you respawn at 0,0,0 on kart sprint maps
* Properly reset your lap count when respawning
* softlocktimer will be replaced with another solution due to various issues

src/d_player.h

@@ -583,7 +583,6 @@ struct player_t
 	// Respawn
 	UINT8 dropdash;			// Gain a burst of speed when you drop while respawning
 	UINT8 respawn;			// Timer given when you die.
-	UINT8 softlocktimer;	// Tracks how fast you died after respawning. Use for softlock prevention.
 	
 	UINT16 flashing;
 	UINT16 spinouttimer;	// Spin-out from a banana peel or oil slick (was "pw_bananacam")

src/g_game.c

@@ -3150,7 +3150,17 @@ void G_ChangePlayerReferences(mobj_t *oldmo, mobj_t *newmo)
 void G_DoReborn(INT32 playernum)
 {
 	player_t *player = &players[playernum];
-	boolean starpost = false;
+
+	if (!K_UsingLegacyCheckpoints() && player->lastsafelap != player->laps)
+	{
+		// no lap cheating! but more importantly, make sure your lap count matches your respawn point
+		player->laps = player->lastsafelap;
+		player->starpostnum = player->lastsafestarpost;
+	}
+
+	// waypoint maps don't need to force respawning at player starts nearly as often
+	const boolean sprint = K_UsingLegacyCheckpoints() ? mapheaderinfo[gamemap - 1]->levelflags & LF_SECTIONRACE && player->laps > 1 : player->laps > 0;
+	const boolean starpost = !player->spectator && (sprint || player->starpostnum || (!K_UsingLegacyCheckpoints() && player->starposttime));
 
 	// Make sure objectplace is OFF when you first start the level!
 	OP_ResetObjectplace();
@@ -3159,12 +3169,6 @@ void G_DoReborn(INT32 playernum)
 		// respawn at the start
 		mobj_t *oldmo = NULL;
 
-		if (player->spectator)
-			;
-		else if ((player->starpostnum || ((player->nextwaypoint != NULL) && player->starposttime))
-		|| ((mapheaderinfo[gamemap - 1]->levelflags & LF_SECTIONRACE) && player->laps)) // SRB2kart
-			starpost = true;
-
 		// first dissasociate the corpse
 		if (player->mo)
 		{

src/k_kart.c

@@ -3032,7 +3032,6 @@ static void K_RespawnChecker(player_t *player)
 			player->mo->colorized = false;
 			player->dropdash = 0;
 			player->respawn = 0;
-			player->softlocktimer = 3*TICRATE;
 		}
 	}
 }
@@ -8213,9 +8212,6 @@ void K_KartPlayerThink(player_t *player, ticcmd_t *cmd)
 	if (player->checkskip)
 		player->checkskip--;
 
-	if (player->softlocktimer)
-		player->softlocktimer--;
-
 	if (player->bigwaypointgap && (player->bigwaypointgap > AUTORESPAWN_THRESHOLD || !P_PlayerInPain(player)))
 	{
 		player->bigwaypointgap--;
@@ -10770,12 +10766,6 @@ void K_UpdateAllPlayerPositions(void)
 				continue;
 			}
 
-			if (player->respawn > 0 && player->lastsafelap != player->laps)
-			{
-				player->laps = player->lastsafelap;
-				player->starpostnum = player->lastsafestarpost;
-			}
-
 			K_UpdatePlayerWaypoints(player);
 		}
 	}

src/p_saveg.c

@@ -251,7 +251,6 @@ static void P_NetArchivePlayers(savebuffer_t *save)
 
 		WRITEUINT8(save->p, players[i].dropdash);
 		WRITEUINT8(save->p, players[i].respawn);
-		WRITEUINT8(save->p, players[i].softlocktimer);
 
 		WRITEUINT16(save->p, players[i].flashing);
 		WRITEUINT16(save->p, players[i].spinouttimer);
@@ -600,7 +599,6 @@ static void P_NetUnArchivePlayers(savebuffer_t *save)
 
 		players[i].dropdash = READUINT8(save->p);
 		players[i].respawn = READUINT8(save->p);
-		players[i].softlocktimer = READUINT8(save->p);
 
 		players[i].flashing = READUINT16(save->p);
 		players[i].spinouttimer = READUINT16(save->p);

src/p_spec.c

@@ -1994,10 +1994,13 @@ static void K_HandleLapIncrement(player_t *player)
 
 			player->starposttime = player->realtime;
 			player->starpostnum = 0;
-			player->lastsafestarpost = 0;
 			player->laps++;
 
-			if (mapheaderinfo[gamemap - 1]->levelflags & LF_SECTIONRACE)
+			if (!K_UsingLegacyCheckpoints())
+			{
+				// do nothing, let waypoint code handle respawn positions
+			}
+			else if (mapheaderinfo[gamemap - 1]->levelflags & LF_SECTIONRACE)
 			{
 				// SRB2Kart 281118
 				// Save the player's time and position.

src/p_user.c

@@ -2512,14 +2512,6 @@ static void P_DeathThink(player_t *player)
 	else
 		player->karthud[khud_timeovercam] = 0;
 
-	// If the player dies too fast or dies during respawn...
-	// Set players next respawn point to the next waypoint for extra safety.
-	if (player->softlocktimer > 0 || player->respawn > 0)
-	{
-		// Now a clean function! Neat, eh?
-		K_SetRespawnAtNextWaypoint(player);
-	}
-
 	K_KartPlayerHUDUpdate(player);
 
 	if (player->pflags & PF_NOCONTEST)