libcommon: Employ the enhanced S_StopSound2() in S_SectorStopSounds()

Switched sector sound stopping to use the sector origin chains on
engine side.

Let us see how this goes with tomorrow's build #479 before we switch
over to using sidedef sound origins for switches.

doomsday/engine/api/doomsday.h

@@ -701,7 +701,10 @@ int S_StartSound(int soundId, struct mobj_s* origin);
 int S_StartSoundEx(int soundId, struct mobj_s* origin);
 int S_StartSoundAtVolume(int soundID, struct mobj_s* origin, float volume);
 int S_ConsoleSound(int soundID, struct mobj_s* origin, int targetConsole);
-void S_StopSound(int soundID, struct mobj_s* origin);
+
+void S_StopSound2(int soundID, struct mobj_s* origin, int flags);
+void S_StopSound(int soundID, struct mobj_s* origin/*,flags=0*/);
+
 int S_IsPlaying(int soundID, struct mobj_s* origin);
 int S_StartMusic(const char* musicID, boolean looped);
 int S_StartMusicNum(int id, boolean looped);

doomsday/plugins/common/src/d_net.c

@@ -394,7 +394,7 @@ int D_NetWorldEvent(int type, int parm, void* data)
         if(parm & 0xffff)
             S_SectorSound(P_ToPtr(DMU_SECTOR, parm >> 16), parm & 0xffff);
         else
-            S_StopSound(0, (mobj_t*) P_GetPtr(DMU_SECTOR, parm >> 16, DMU_BASE));
+            S_SectorStopSounds(P_ToPtr(DMU_SECTOR, parm >> 16));
 
         break;
 

doomsday/plugins/common/src/p_sound.c

@@ -75,12 +75,9 @@ void S_SectorStopSounds(Sector* sec)
 {
     if(!sec) return;
 
-    S_StopSound(0, (mobj_t*) P_GetPtrp(sec, DMU_BASE));
-
     // Stop other sounds playing from origins in this sector.
     /// @todo Add a compatibility option allowing origins to work independently?
-    S_StopSound(0, (mobj_t*) P_GetPtrp(sec, DMU_FLOOR_BASE));
-    S_StopSound(0, (mobj_t*) P_GetPtrp(sec, DMU_CEILING_BASE));
+    S_StopSound2(0, (mobj_t*) P_GetPtrp(sec, DMU_BASE), SSF_ALL_SECTOR);
 }
 
 void S_PlaneSound(Plane* pln, int id)