bugfix: angular aot appears to not able to import {x as a} from './a'…

use web component for dataset preview

Feat/opacity slider

bugfix menu collapse

fixes https://github.com/HumanBrainProject/interactive-viewer/issues/466

bugfix: plugin state no longer honored

fix https://github.com/HumanBrainProject/interactive-viewer/issues/465

Dev spatial backend for change template

bugfix: url parsing + added test

added test for restoring state

chore: use regionId for querying dataset

Dev show connectivity dataset