Implement a method for manual declaration of implicits.

This is intended to be separate from handling of implicit binders.
The remaining uses of declare_manual_implicits satisfy a lot of
assertions, giving the possibility of simplifying the interface in the
future.

Two disabled warnings are added for things that currently pass silently.

Currently only Mtac passes non-maximal implicits to
declare_manual_implicits with the force-usage flag set. When implicit
arguments don't have to be named, should move Mtac over to
set_implicits.

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