QC, DOCS: Added infokey for disabling backpacks in deathmatch

docs/deathmatch-setup-guide.txt

@@ -117,6 +117,7 @@ serverinfo rj 20						Scales rocket jump push force by a factor of 20. (Set to 0
 serverinfo have_axe_only 1				Disables all weapons except for the axe.
 serverinfo buffed_axe 1					Increases the axe's damage.
 serverinfo have_unlimited_ammo 1		Players have unlimited ammo.
+serverinfo disable_backpacks 1			Players do not drop weapon or ammo backpacks on death.
 
 serverinfo have_super_shotgun 1			Players spawn with the Double-Barreled Shotgun.
 serverinfo have_nailgun 1				Players spawn with the Nailgun.

qcsrc/deathmatch_settings.qc

@@ -466,6 +466,17 @@ float() deathmatch_no_mega_health =
     return FALSE;
 };
 
+// Stops players from dropping backpacks on death
+float() deathmatch_no_backpacks =
+{
+#ifdef __QW__ // NQ does not support infokeys
+    if (deathmatch && stof(infokey(world, "disable_backpacks")) != 0)
+        return TRUE;
+#endif
+
+    return FALSE;
+};
+
 // Quad is dropped on death
 float() deathmatch_drop_quad =
 {

qcsrc/player.qc

@@ -657,7 +657,7 @@ void() PlayerDie =
 	self.radsuit_finished = 0;
 	self.modelindex = modelindex_player;	// don't use eyes
 
-	if (deathmatch || coop)
+	if ((deathmatch || coop) && !deathmatch_no_backpacks())
 		DropBackpack();
 
 	self.weaponmodel=string_null;