expmt: get related regions
maint: refactor

maint: siibra-api version

feat: allow fsaverage grid toggle
feat: allow feature download
maint: surface face selection disabled

feat: rgb colormap control
fix: touch control not working

maint: added css to vanilla.html

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

... 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

maint: external precomputed layer now fetches and sets transform

multiple variant meshes
bugfix: fsaverage err URL encoding selected
regions
maint: some simplification