feat: show opacity slider

fixed: fsaverage rubber banding

maint: simplify periodic service

fix: connectivity matrix input fire rate
fix: conn busy spinner
feat: added selected subject & dataset

maint: update nehuba dependency

minor refactor

TODO:

- annotation
- real space not yet available
- nehuba status panel busted
- check swc works

generally working with the following caveats:

- fsaverage busted
- annotation not yet working
- colin27 busted
- real space interpolation values not yet available
- (as a result of above) nehuba status panel not yet working

ALSO TO CHECK:
- swc

maint: use angular cdk for spotlight

feat: enable rat connectivity

fix: point assignment for label parcellations

fix: fallback if message method not defined

fix: filter by message namespace

maint: update CI version
maint: remove deprecated use of cmpfactory

maint: bump ng-layer-tune version (shader state...

... persistence)
maint: added markdown descriptor for slice view quick starter guide
fix: fixed neuron messing, passing message to api service if not found
fix: api method typos

fix: wireframe querying

fix: cortical layer