Refactor code to use Parameters::accept() instead of Routine::accepts()

[thekid]

On top of #8, which had this:

$method= ...
if ($method->accepts($args)) {
  // ...
}

...now the code would look like this:

$method= ...
if ($method->parameters()->accept($args)) {
  // ...
}

...because when testing the parameters accept the given arguments, it might be clearer that only the type constraints are checked and the method can still raise an error.

[thekid]

The optional count parameter makes it easier to test for usecases such as one-arg constructors and testing whether the given arguments would be accepted all in the same method call:

if ($type->constructor()?->parameters()->accept($args, count: 1)) {
  // ...
}

Here's an example of the simplification (written with PHP 7 support in mind):

-      } else if (($c= $reflect->constructor()) && 1 === $c->parameters()->size() && $c->accepts([$value])) {
+      } else if (($c= $reflect->constructor()) && $c->parameters()->accept([$value], 1)) {

[thekid]

Released in https://github.com/xp-framework/reflection/releases/tag/v1.2.0