Partial cleanup of argument count validation in mdoc(7):

* Do not segfault on empty .Db, .Rs, .Sm, and .St.
* Let check_count() really throw the requested level, not always ERROR.
* Downgrade most bad argument counts from ERROR to WARNING.
* And some related internal cleanup.

Looks fine to kristaps@.

Note that the macros using eerr_ge1() still need to be checked at a later
time; but as all the others are done, let's use what we already have.

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