sprites: new gib animations (zombie and shotgunner)

Removed empty spaces, added propper offsets (courtesy of Matt)

buildcfg.txt

@@ -1799,15 +1799,15 @@ POSSI0		19	42
 POSSJ0		22	34
 POSSK0		24	27
 POSSL0		25	19
-POSSM0		20	59
-POSSN0		21	62
-POSSO0		24	61
-POSSP0		26	55
-POSSQ0		27	51
-POSSR0		28	43
-POSSS0		28	36
-POSST0		28	26
-POSSU0		28	21
+POSSM0      21   61
+POSSN0      24   56
+POSSO0      26   55
+POSSP0      30   47
+POSSQ0      30   40
+POSSR0      31   30
+POSSS0      29   23
+POSST0      30   17
+POSSU0      31   16
 
 SARGA1	17	55
 SARGA2A8	25	54
@@ -1907,15 +1907,16 @@ SPOSI0	17	48
 SPOSJ0	21	34
 SPOSK0	22	29
 SPOSL0	26	20
-SPOSM0	18	54
-SPOSN0	23	57
-SPOSO0	24	56
-SPOSP0	26	50
-SPOSQ0	27	46
-SPOSR0	28	38
-SPOSS0	28	31
-SPOST0	28	21
-SPOSU0	28	11
+SPOSM0      18   61
+SPOSN0      19   56
+SPOSO0      24   55
+SPOSP0      27   47
+SPOSQ0      31   40
+SPOSR0      32   30
+SPOSS0      31   23
+SPOST0      35   17
+SPOSU0      34   16
+
 TROOA1	23	56
 TROOA2A8	17	57
 TROOA3A7	16	56