Try Fox support for highlighting feature flags that need to be enabled

[jonalmeida]

I'd like to be able to install a build from Try Fox, launch it from there, and have it take me to the Secret Settings screen with feature flags that a developer has asked me to enable in order to see a WIP prototype.

[jonalmeida]

We have tryfox URI now, so appending some flags there for us, so we can cache those while we install the app, and launch an intent with those feature flags to take us to Secret Settings. We can either prompt users to enable them by highlighting/glowing those options or filter a search result of them - any direction along that path would be nice.