[layout] Make build-time filesystem layout explicit #23
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Prior to this change the build-time filesystem layout was created implicitly from the package names. This method breaks for nested workspaces where package names differ depending on their context.
This makes built-time layout explicit by introducing a "layout" section in the package description. If no explicit layout is set, leeway will fall back to its prior behaviour and use the dependency's filesystem safe name. This mechanism is implemented during linking s.t. the build-time layout stays stable across nested workspaces.
leeway describe
has been updated accordingly to show the layout.leeway vet
finds layout path clashes if two dependencies occupy the same path at build-time.