New version: ObservableCortex v0.4.0

[JuliaRegistrator]

• Registering package: ObservableCortex
• Repository: https://github.com/myersm0/ObservableCortex.jl
• Created by: @myersm0
• Version: v0.4.0
• Commit: 9c3b15c3f6713cb9df26954b1262e3b37e616434
• Reviewed by: @myersm0
• Reference: myersm0/ObservableCortex.jl@9c3b15c#commitcomment-164524870
• Description: A Julia package for interactively visualizing and animating 3d cortical surface meshes, inspired by Connectome Workbench's wb_view
• Release notes:

## Breaking changes
- Renamed OrthographicView → Panel, OrthographicLayout → PanelLayout, and Montage.views → Montage.panels
- Updated dependencies, especially CIFTI for v2.0, and CorticalSurfaces and CorticalParcels for v0.11
- Made method signatures more generic where possible

## New features
- Montage now contains a `plots` component that stores a matrix of `Makie.Mesh` plots, which are accessible now by `getindex(m::Montage, ...)` (see README for more info)
- `plot!(m::Montage, ...)` now accepts an Observable as the values to plot
- Improved tests and extended demos (the latter still in progress)

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