`Via` and `Eval`

In practice I never use `Via(...)` which perhaps is because I do not consistently use the logging API.
Also, it appears that `Eval` is now a static keyword.

Also, as a semantic marker (used to find every logging call in an AL program), looks like `log &&` suffices; so perhaps `status.Via()` can be obsoleted.

If `Eval` is statically available, update documentation to reflect the change.