The run configurations I put together in #504 didn't allow for the
debugger to work properly: neither pause nor breakpoints had any effect.

Fixes #571

The callable annotator is meant for variables, parameters, and macro and
function calls and declarations.  The ModuleAttribute annotator handles
ModuleAttribute declaration and usage, so we can save reference
resolution time by skipping module attributes in Callable.

Instead of highlighting call definition clauses when they are referred
to, which only works if it is in the same file, highlight all function
and macro declarations when the def* call is encountered.