refactor: split script into modules and drop queue save/load

mpv-youtube-queue.conf

@@ -1,10 +1,8 @@
 add_to_queue=ctrl+a
-default_save_method=unwatched
 download_current_video=ctrl+d
 download_selected_video=ctrl+D
 move_cursor_down=ctrl+j
 move_cursor_up=ctrl+k
-load_queue=ctrl+l
 move_video=ctrl+m
 play_next_in_queue=ctrl+n
 open_video_in_browser=ctrl+o
@@ -12,18 +10,17 @@ open_channel_in_browser=ctrl+O
 play_previous_in_queue=ctrl+p
 print_current_video=ctrl+P
 print_queue=ctrl+q
-save_queue=ctrl+s
-save_full_alt=ctrl+S
 remove_from_queue=ctrl+x
 play_selected_video=ctrl+ENTER
 browser=firefox
 clipboard_command=xclip -o
 cursor_icon=➤
 display_limit=10
+max_title_length=60
 download_directory=~/videos/YouTube
 download_quality=720p
 downloader=curl
-font_name=JetBrainsMono
+font_name=JetBrains Mono
 font_size=12
 marked_icon=⇅
 menu_timeout=5