Activate special environments similar to Julia's CLI arg --project
#3821
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Similar to Julia's command line argument
--project
,activate @temp
activates temp environment(See Set temporary env whenever Julia is started with
--project=@temp
julia#51149)activate @stdlib
activatesSys.STDLIB
activate @.
activates current projectactivate @
activates active projectThis also changes how Pkg.activate behaves wrt
temp
(disallows) andstdlib
(activates@stdlib/Project.toml
)Related to these, the PR adds tests and updates docs.