Allow Python-like 'object = ClassName(ctor args)' constructor calls.

The discussions we've read about Lua classes conventionally use
ClassName:new() as the constructor, and so far we've followed that convention.

But setting metaclass(ClassName).__call = ClassName.new permits Lua to respond
to calls of the form ClassName(ctor args) by implicitly calling
ClassName:new(ctor args).

Introduce util.classctor(). Calling util.classctor(ClassName) sets ClassName's
metaclass's __call to ClassName's constructor method. If the constructor method
is named something other than new(), pass ClassName.method as the second arg.

Use util.classctor() on each of our classes that defines a new() method.

Replace ClassName:new(args) calls with ClassName(args) calls throughout.

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