Allow typification of variables and values across load generations

The original semantics turned out to be too restrictive. For example, the
user may have specified the config.c variable on the command line that is
only used by an imported project that is loaded in a subsequent generation.

We are also relaxing it for values since conceptually the two feel the same.
For a value the (hypothetical) example is a "common" variable set in a project
root that is only queried in a subdirectory in a subsequent generation.

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