chore: added mouse over

chore: update to latest brainscape api sig

bugfix: malformed selected region url encoding

chore: use env var for bs api

feat: fetch receptor from bs

Bugfix misc

chore: reworked how state in url are parsed

bugfix: uri state

Chore slash separator

fix e2e bugs from query param to hash

bugfix: properly find parcellation

bugfix: region colour