Add MPRIS support (#25)

* Stop mpv on app close for linux/macOS (#20)

* Add initial MPRIS support

* Fix mpv path check

release/app/package.json

@@ -12,6 +12,8 @@
     "link-modules": "node -r ts-node/register ../../.erb/scripts/link-modules.ts",
     "postinstall": "npm run electron-rebuild && npm run link-modules"
   },
-  "dependencies": {},
+  "dependencies": {
+    "mpris-service": "^2.1.2"
+  },
   "license": "GPL-3.0"
 }