trigger bomb has now a time limit

src/basic.h

@@ -19,6 +19,7 @@
 #define EXPLOSION_SAVE_DISTANCE 64
 #define SPECIAL_TRIGGER_TIMEOUT 15
 #define SPECIAL_TRIGGER_NUMUSE 5  // 0=unlimited
+#define SPECIAL_TRIGGER_TIME 25
 #define SPECIAL_ROW_TIME 30
 #define SPECIAL_PUSH_TIME 50
 #define SPECIAL_KICK_NUMUSE 8

src/special.c

@@ -149,6 +149,7 @@ special_pickup (int p_nr, int s_nr) {
 	switch(s_nr) {
 		case SP_trigger:
 			s->numuse=SPECIAL_TRIGGER_NUMUSE;
+			s->to=SPECIAL_TRIGGER_TIME*TIME_FACTOR;
 			break;
 		case SP_row :
 			s->to=SPECIAL_ROW_TIME*TIME_FACTOR;