Storing queries, split state, and time range in URL.
- harmonize query serialization when generating Explore URLs in
dashboards (use of `renderUrl`)
- move URL parse/serialization to Wrapper
- keep UI states under two keys, one for left and one for right Explore
- add option to angular router to not reload page on search change
- add lots of types
- fix time service function that gets triggered by URL change
Without this fix then the querystring looks like ?abool=true which causes
a mismatch with the angular routing. This results in a redirect and messes
up the browser history and back button.
