Require manual mode setting for choices

Do not change the mode if y is assigned to a choice symbol inside a
choice in m mode, for example. Require Choice.set_value() to be called
instead.

This makes choices way less magical and more menuconfig-like. It would
also be confusing to be able to assign y to a choice symbol when y is
not in sym.assignable.

Set the mode manually in load_config() (y assigned to a choice symbol =>
y mode, and ditto for m). Change the warning for inconsistent values to
one that's probably less confusing, though the old one was closer to the
warning printed by the C implementation.

Need to fix a bunch of tests too...

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