* Remove global cache variable.
Rather than maintaining cached data in a global variable, instantiate a cache struct and keep it in the `Server` struct.
* Store net params in RPC clients.
This means net params only need to be supplied once at startup, and also removes a global instance of net params in `background.go`.
This renames "Voting wallet status" to "VSP status" and it now includes the status of the local dcrd instance. This change impacts both the /admin page of the UI, and the response of the /admin/status API endpoint.
* Remove static cfg values from GUI cache.
Theres no need for these values to be copied into the cache when templates could simply access the config struct directly.
This also changes the cache accessor so it returns a copy of the cache rather than a pointer, which removes a potential race.
* Rename and move cache.
Cache code was previous in `homepage.go`, but its used in multiple places and not just on the homepage. Its enough code to go into its own dedicated `cache.go`.
- Use bootstrap to improve layout.
- Add warning banners for webserver debug mode and vspd closed.
Admin page:
- Replace listing of all tickets with form to search by ticket hash
