Remove obsolete comment.
Add Default Parameters (but not default arguments)

Most of the code for default parameters/arguments is now in.
The only things that still needs to be implemented are:
* The ability to pass values to them with DefaultArguments, and
* The modifications to calling conventions that allow you to call
  certain functions when they take DefaultParameters (e.g. Constructors)
Add Default Arguments

This allows methods and function-typed values which take default
arguments to be called, and for values to be optionally passed into
them.
For example, if we have the following method:

void foo(uint x = 1, string str = "")
{
  // do stuff
}

We can specify any combination of its arguments, and even convert it to
a function value:

foo();
foo(x = 1, str = "hello");
foo(str = "world");
foo(str = "blah", x = 5);

{uint x = ..., string str = ... -> void} bar = foo;
bar();
bar(str = "hi");
bar(x = 9);