`Via` and `Eval`

[eelstork]

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.