serialize: Read/emit tuples with {read,emit}_tuple

This commit moves from {read,emit}_seq for tuples to {read,emit}_tuple, as well
as providing a generalized macro for generating these implementations from one
invocation.

Closes #13086
This commit cleans up a few test warnings
auto merge of #13095 : alexcrichton/rust/serialize-tuple, r=huonw

This commit moves from {read,emit}_seq for tuples to {read,emit}_tuple, as well
as providing a generalized macro for generating these implementations from one
invocation.

Closes #13086
auto merge of #13096 : sstewartgallus/rust/cleanup-test-warnings, r=huonw
Documentation sprint: Terminfo