* Chore: move constants to own file
* Chore: moves safe* functions to grafana/data
* Chore: moves safe* functions to grafana/data
* Chore: adds VariableQueryEditorProps and deprecates VariableQueryProps
* Chore: remove getDefaultVariableAdapters function
* Chore: moves transaction status to types
* Chore: fix tests that do not initialise TemplateSrv
* Chore: change space when stringifying
* Chore: revert safe* func move
* Chore: remove circular dependency in Explore utils
* explore: allow switching graph-styles
* refactor: simplify code
* adjust test to test a case that can really happen
* better generate-options approach
* explore: graph styles: remove url functionality
* not-stacked-bars should be filled