Add drowning

src/script/common/c_content.cpp

@@ -389,6 +389,7 @@ ContentFeatures read_content_features(lua_State *L, int index)
 	f.liquid_viscosity = getintfield_default(L, index,
 			"liquid_viscosity", f.liquid_viscosity);
 	getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
+	getboolfield(L, index, "drowning", f.drowning);
 	// Amount of light the node emits
 	f.light_source = getintfield_default(L, index,
 			"light_source", f.light_source);

src/script/lua_api/l_object.cpp

@@ -62,6 +62,7 @@ struct EnumString es_HudBuiltinElement[] =
 	{HUD_FLAG_HEALTHBAR_VISIBLE, "healthbar"},
 	{HUD_FLAG_CROSSHAIR_VISIBLE, "crosshair"},
 	{HUD_FLAG_WIELDITEM_VISIBLE, "wielditem"},
+	{HUD_FLAG_BREATHBAR_VISIBLE, "breathbar"},
 	{0, NULL},
 };