Change rageshake persistence to throttled flushing

Rather than every 30 seconds. This way we'll save logs for sessions
lasting less than 30 seconds which we previously didn't. Also save
on window unload just in case that doesn't catch everything.

Plus remove some more unused params.

package.json

@@ -45,7 +45,8 @@
     "i18next": "^21.10.0",
     "i18next-browser-languagedetector": "^6.1.8",
     "i18next-http-backend": "^1.4.4",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#2c8eece5ca5333c6e6a14e8ed53f359ed0e9e9bf",
+    "lodash": "^4.17.21",
+    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#7b10fa367df357b51c2e78e220d39e5e7967f9e3",
     "matrix-widget-api": "^1.0.0",
     "mermaid": "^8.13.8",
     "normalize.css": "^8.0.1",