Now meta-functions can be overloaded. When a function with a duplicate
identifier is registered, it's added into the meta-type function list after the
first meta-function with the same id. During the invocation, the meta-functions
with the requested id are iterated, and the best matching one is chosen. The
overload that doesn't require any type conversions or the minimal number of
those is considered the best match. If none of the overloads matches the given
arguments or if there are multiple matching overloads requiring the same number
of type casts then the invocation will fail the same way it happens in C++.
Signed-off-by: Innokentiy Alaytsev <alaitsev@gmail.com>
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