Pseudo-elements must start with double colons pseudo-element

fix(graph): remove panel width cache, causing issues, does not handle window resize and fullscreen to dashboard, #5297

* OpenTSDB: consistent options for http requests

 . the get function wasn't using the same request options wrt to credentials/auth as
   the timeseries http request

* OpenTSDB: `_get` `_performTimeSeriesQuery` refactor copied code

fix(share): fixed PNG render link generated from share modal when opened from edit mode, fixes #5295

* Add default-url property for datasource-http-settings directive.
This will allow to set default url for datasource.

* Fixed spelling.

* Use typeahead for url suggestion.

This reverts commit 3d776851.