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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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so the user need not reverse-engineer the code to figure out the output.
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Since timers presents a timers.Timer Lua class supporting queries and
cancellation, make TimersListener::scheduleAfter() and scheduleEvery() respond
immediately so the newly constructed Timer object has the reqid necessary to
perform those subsequent operations.
This requires that Lua invocations of these operations avoid calling the
caller's callback with that initial response.
Reinvent leap.generate() to return a Lua object supporting next() and done()
methods. A plain Lua coroutine that (indirectly) calls fiber.wait() confuses
the fiber scheduler, so avoid implementing generate() as a Lua coroutine.
Add a bit more leap.lua diagnostic output.
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