Method insert_bgm

src/script.rs:142–144

(&mut self, index: usize, bgm: String)

        self.name = name.to_string();
    }

    pub(crate) fn set_read_block(&mut self, read_block: usize) {
        self.read_block = read_block;
    }

    pub(crate) fn read_block(&self) -> usize {