Routing and controller arguments in K3

Hey gang,

So, calling controller actions with arguments was carried over to 3.0,
deprecated in 3.1, and removed in 3.2.

Example: we want index.php/bar/foo/123.  What used to be this:

public function foo($id=null) {
  // Do something with $id = 123...
}

Will now need to be something like this:

public function action_foo() {
  $id = $this->request->param("id", null);
  // Do something with $id = 123...
}

With a route defined like this:

Route::set("example", "(<controller>(/<action>(/<id>)))")

A quick survey of Gallery's controllers (in the core repo) shows that,
in 162 controller actions, we have:
- 81 with 0 args
- 70 with 1 arg (typically named something like $id)
- 9 with 2 args
- 1 with 3 args
- 1 with 4 args
- 0 with 5+ args

So, here's my proposal: we optimize ourselves for 0-1 arguments, and
make a flexible system to handle 2+.  We use a route something like
this:

Route::set("example", "(<controller>(/<action>(/<id>(/<args>))))")
  ->filter( // Use an explode for "/" to parse args into an array here )

And then access them like this:

$id = $this->request->param("id");
$args = $this->request->param("args");
$second = $args[0];
$third = $args[1];
$fourth = $args[2];
$fifth = $args[3];
...
$fiftieth = $arg[48];

This keeps our typical cases simple and lean, while being totally
flexible for our other 11 cases as well as anything a contrib module
could dream up.  Does this seem like a reasonable approach?

Take care,
Shad

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