refactor(headers): Introduce header!() macro, improve documentation #419
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The new macro handles single value headers, list headers, and list
headers with at least one item.
It creates the item for the header and contains its documentation. The
new macro allows handling
more header cases in the future, it will also be possible to include
tests inside the macro.
BREAKING_CHANGE: Removed impl_header!() and impl_list_header!() macros,
use new header!() macro.