Add <- and -> hotkeys, to jump to previous or next song

Refers to #585

ui/package-lock.json

@@ -13562,14 +13562,12 @@
       "resolved": "https://registry.npmjs.org/react-ga/-/react-ga-3.1.2.tgz",
       "integrity": "sha512-OJrMqaHEHbodm+XsnjA6ISBEHTwvpFrxco65mctzl/v3CASMSLSyUkFqz9yYrPDKGBUfNQzKCjuMJwctjlWBbw=="
     },
-    "react-hot-keys": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/react-hot-keys/-/react-hot-keys-2.6.0.tgz",
-      "integrity": "sha512-q7UKLGxZyWhIeyNp4TIp5ardcIF5lPeS8Lmh5gTKH+4IOQDrfMkyvAoz1XFYKR2UDc4GW9sEDrzVrqVZu/HrAw==",
+    "react-hotkeys-hook": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/react-hotkeys-hook/-/react-hotkeys-hook-2.4.0.tgz",
+      "integrity": "sha512-Veh9FUe+iXab+lZ5shPoyGDnFBu5codQ15omOXiOvCC/Q5QfTY1lefLVx/Zi2NnYBSXfkfQbhnpE+Rnhi2+wBw==",
       "requires": {
-        "@babel/runtime": "^7.8.4",
-        "hotkeys-js": "^3.8.1",
-        "prop-types": "^15.7.2"
+        "hotkeys-js": "3.8.1"
       }
     },
     "react-icons": {