chore: removed deprecated, unused vars/files

Chore fix mesh hiding

bugfix: circular imports
bugfix: catch annotation svc  undefined reference
chore: added transform backend to csp

chore: small ui fix on voi volume control
chore: added pli service link redirection

fix empty quick tour

UI/Bugfix for 2.7.0 release

chore: fix indent

- via parc chips (different versions)
- via tmpl parc selection panel

bugfix: selected parc highlight
bugfix: base parc chip

bugfix: skip deprecated parcellation versions

chore: update package name
chore: update csp

bugfix: fix touch ctrl, fix api endpoint

bugfix: on nav, hide frontal becomes reset
bugfix: siibra api endpoint

v2.7.0

correct github action backend url

bugfix: navigateTo region

bugfix: allow surface viewer to use custom link

feat: allow plugin to add and remove custom layer

bugfix: allow layer transparency to be modified via ng custom layer