Annoyances with traits

[F i L]

I'd like to add to what I suggested earlier. Conversion between
types is a common and expected behavior. Because std.conv is
small, and the new UFCS is here, I think object.d could benefit.
Hear what I had in mind:

+ Move std.conv functionality to object.d
+ Move Object.toString() from the base class, to free space.
+ Make toString() simply wrap to!string() and depreciate it.
+ Replace parse!() with a more intelligent to!()/string

+ emplace!() would be handy to always have around :)
+ idk what to do with text!() :/

Now we can convert types as a language feature, and toString()
still works, but universally on any type that defines opCall().
Also, like I said, toString() might just wrap to!string() and be
marked as depreciated (since we already have .stringof).

      auto name = "Jacque Fresco";
      auto age = 96;

      writeln("Hi, I'm ", name, ".");
      writeln("I'm ", age.text(), " years old");
      writeln("This shit's got to go!"); // ;)

      writeln("How old are you?");

      auto line = readln();
      auto theirAge = line.to!int();