Reset rollangle on TNT explosion

This is the where the extreme lag when TNT Barrels explode came from. Probably
because the sprites are big and there's four of 'em! It shouldn't matter that
these aren't rotated--they're pretty round.

src/info.c

@@ -2343,12 +2343,13 @@ state_t states[NUMSTATES] =
 	// TNT barrel
 	{SPR_BARR, 0, -1, {NULL}, 0, 0, S_NULL}, // S_TNTBARREL_STND1
-	{SPR_BARX, 0|FF_FULLBRIGHT, 3, {A_SetObjectFlags}, MF_NOCLIP|MF_NOGRAVITY|MF_NOBLOCKMAP, 0, S_TNTBARREL_EXPL2}, // S_TNTBARREL_EXPL1
-	{SPR_BARX, 1|FF_FULLBRIGHT, 2, {A_TNTExplode}, MT_TNTDUST, 0, S_TNTBARREL_EXPL3}, // S_TNTBARREL_EXPL2
-	{SPR_BARX, 1|FF_FULLBRIGHT, 1, {NULL}, 0, 0, S_TNTBARREL_EXPL4}, // S_TNTBARREL_EXPL3
-	{SPR_BARX, 2|FF_FULLBRIGHT, 3, {NULL}, 0, 0, S_TNTBARREL_EXPL5}, // S_TNTBARREL_EXPL4
-	{SPR_BARX, 3|FF_FULLBRIGHT, 3, {NULL}, 0, 0, S_TNTBARREL_EXPL6}, // S_TNTBARREL_EXPL5
-	{SPR_NULL, 0, 35, {NULL}, 0, 0, S_NULL}, // S_TNTBARREL_EXPL6
+	{SPR_BARX, 0, 0, {A_RollAngle}, 0, 1, S_TNTBARREL_EXPL2}, // S_TNTBARREL_EXPL1
+	{SPR_BARX, 0|FF_FULLBRIGHT, 3, {A_SetObjectFlags}, MF_NOCLIP|MF_NOGRAVITY|MF_NOBLOCKMAP, 0, S_TNTBARREL_EXPL3}, // S_TNTBARREL_EXPL2
+	{SPR_BARX, 1|FF_FULLBRIGHT, 2, {A_TNTExplode}, MT_TNTDUST, 0, S_TNTBARREL_EXPL4}, // S_TNTBARREL_EXPL3
+	{SPR_BARX, 1|FF_FULLBRIGHT, 1, {NULL}, 0, 0, S_TNTBARREL_EXPL5}, // S_TNTBARREL_EXPL4
+	{SPR_BARX, 2|FF_FULLBRIGHT, 3, {NULL}, 0, 0, S_TNTBARREL_EXPL6}, // S_TNTBARREL_EXPL5
+	{SPR_BARX, 3|FF_FULLBRIGHT, 3, {NULL}, 0, 0, S_TNTBARREL_EXPL7}, // S_TNTBARREL_EXPL6
+	{SPR_NULL, 0, 35, {NULL}, 0, 0, S_NULL}, // S_TNTBARREL_EXPL7
 #ifndef ROTSPRITE
 	{SPR_BARR, 1|FF_ANIMATE, -1, {NULL}, 7, 2, S_NULL}, // S_TNTBARREL_FLYING
 #else

src/info.h

@@ -2503,6 +2503,7 @@ typedef enum state
 	S_TNTBARREL_EXPL4,
 	S_TNTBARREL_EXPL5,
 	S_TNTBARREL_EXPL6,
+	S_TNTBARREL_EXPL7,
 	S_TNTBARREL_FLYING,
 
 	// TNT proximity shell