Warn users that the Makefile is now deprecated #750
Merged
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As outlined in #748, this implements options 3/4/5 of the last section. It's mainly for @NuclearMonster, on the wording and timing, but I'm open to suggestions from anyone. It adds a skippable message to invocations of the Makefile, warning that the Makefile is going away. If we set REQUIRE_DEPRECATION_ACK=1 it becomes a hard error and the user must acknowledge the message to keep it working.