v2.12.0

Feature

• added opacity slider for external volumes, even if the more detail is collapsed.
• enable rat connectivity
• added visual indicators for selected subject and dataset in connectivity browser

Bugfix

• fixed fsaverage viewer "rubber banding"

Behind the scene

• update spotlight mechanics from in-house to angular CDK
• updated neuroglancer/nehuba dependency. This allows volumes with non-rigid affine to be displayed properly.
• allow siibra-api endpoint to be configured at runtime