* Simplify workspace API a bit
* Comment on behavior of workspace-layout relations where exposed in API
* Remove annoying getters/setters
* Avoid lookups if we can early exit
* A NULL check is removed in `direct_link_workspace()` that I don't see
a need for. Am not 100% sure though, fingers crossed.
In general these changes should improve readability and make things
easier to reason about.
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