Misc chore+refactor (#598)

* bugfix: unit test on nehubaContainer.component.ts
chore: distinguish background in region sidebar menu
chore: typing for injection tokens
ui: move atlas selector to top right
chore+refactor: clean ng viewer store helper
chore+refactor: turn const into enums
chore+refactor: viewerState.store
refactor: nehubaViewerUnit into nehubaModule
refactor: databrowser feature store -> separate module for unit tests

* chore: region directive

* chore: fixlint
chore: travis ci test build