[FEATURE] UX Refactoring

Changes:

• Debug Selection is now the last option in the plugin as it is usually not used.
• An option for showing/hiding the video descriptions is added to the plugin. Per default, all descriptions are displayed. This changes the behavior for playlists which previously never showed descriptions. All other plugins are not affected by this change as they always displayed descriptions if they were available.
• The plugin backend preview has been refactored. It is now created manually, but more specifically to better show the user what settings apply to the plugin.