merge source (#3)

* Added Discord timeout

* Add getOptions in plugin util

* Mutex in ffmpeg conversion (only supports one command at a time)

* Add menu customization in plugin system

* Add ytpl package (playlist info)

* Handle ffmpeg metadata flags when metadata is not present

* Only use artist in file name if present

* Export sendError method

* Handle image not present in metadata util

* Add downloader utils (getFolder and default menu label)

* Pass (optional) existing metadata and subfolder in mp3 converter

* Add listener to download playlist

* Add custom menu in downloader plugin ("download playlist" item)

* nit: fix main CSS style

* Only set the "enable" item in menu if plugin not enabled

* Navigation plugin: inject HTML once CSS is loaded

Co-authored-by: Sem Visscher <semvisscher10@gmail.com>
Co-authored-by: TC <th-ch@users.noreply.github.com>

plugins/navigation/templates/back.html

@@ -20,7 +20,7 @@
 				preserveAspectRatio="xMidYMid meet"
 				focusable="false"
 				class="style-scope iron-icon"
-				style="pointer-events: none; display: block; width: 100%; height: 100%;"
+				style="pointer-events: none; display: block; width: 100%; height: 100%"
 			>
 				<g class="style-scope iron-icon">
 					<path