feat(custom): make spotify module generic

Set class via json attribute
Choose icon via alt attribute

resources/config

@@ -4,7 +4,7 @@
     // "height": 30, // Waybar height
     // "width": 1280, // Waybar width
     // Choose the order of the modules
-    "modules-left": ["sway/workspaces", "sway/mode", "custom/spotify"],
+    "modules-left": ["sway/workspaces", "sway/mode", "custom/media"],
     "modules-center": ["sway/window"],
     "modules-right": ["idle_inhibitor", "pulseaudio", "network", "cpu", "memory", "temperature", "backlight", "battery", "battery#bat2", "clock", "tray"],
     // Modules configuration
@@ -95,9 +95,14 @@
         },
         "on-click": "pavucontrol"
     },
-    "custom/spotify": {
-        "format": " {}",
+    "custom/media": {
+        "format": "{icon} {}",
+        "return-type": "json",
         "max-length": 40,
+        "format-icons": {
+            "spotify": "",
+            "default": "🎜"
+        },
         "escape": true,
         "exec": "$HOME/.config/waybar/mediaplayer.py 2> /dev/null" // Script in resources folder
     }