added dialog start radius and background by time in cutscenes

src/dialogue/DialogueDatabase.cpp

@@ -121,6 +121,7 @@ CutsceneLine DialogueDatabase::parseCutsceneLine(const json& j) {
 	line.text = j.value("text", "");
 	line.portrait = j.value("portrait", "");
 	line.sfx = j.value("sfx", "");
+	line.background = j.value("background", "");
 	line.durationMs = j.value("durationMs", 0);
 	line.waitForConfirm = j.value("waitForConfirm", false);
 	return line;