More notifications and move start code to another file

src/quiz.rs

@@ -1,12 +1,12 @@
 use crate::lang::KanaSet;
 use crate::navigation::Page::PreviousPage;
-use crate::navigation::{NavigatedPage, Page};
+use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::quiz::QuizMessage::*;
 use crate::styling::*;
-use crate::{RootMessage, USER_FONT};
 use iced::widget::*;
 use iced::{Element, Fill, Task, alignment};
 use rand::seq::SliceRandom;
+use crate::app::USER_FONT;
 
 #[derive(Clone, Debug)]
 pub struct QuizState {