Test World Import

Not applicable
Issue description

I want that the Test World is a part of the Workspace, so we can import our world in the .mcr file and so we don't lose our builds

Issue comments

When we make workspaces in separate folders, each workspace will have own world saves so this will happen automatically when we switch to folder based workspaces, which will be in 2.x.x or most likely even sooner :)

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