disable non-at-eval macrocall linting

[pfitzseb]

for bindings and refs. This shouldn't be too expensive, even though a bit hacky.

Fixes julia-vscode/julia-vscode#2187.

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[ZacLN]

Looks good in principle. If the call added in collect_hints proves costly I think it can be wrapped up (messily) into the call to is_in_fexpr earlier in the line.

Tests need looking at