* Explore: Take root_url setting into account when redirecting from dashboard to explore
* Explore: Move adding of subath to getExploreUrl function
* Explore: Fix explore redirect for key bindings
* move queryRunner to panelModel
* Added interval back as prop, not used yet
* PanelQueryRunner: Refactoring, added getQueryRunner to PanelModel
* PanelQueryRunner: interpolatel min interval
- extends handlers for panel menu and keypress 'x'
- in a mixed-datasource panel finds first datasource that supports
explore and collects its targets
- passes those targets to the found datasource to be serialized for
explore state
- removed `supportMetrics` and `supportsExplore`
- use datasource metadata instead (set in plugin.json)
- Use angular timeout to wrap url change for explore jump
- Extract getExploreUrl into core/utils/explore