Refactoring Kernel argument management

Add

• Replace Arguments<'arg> trait into ArgRef trait
• Introduce ArgRef trait and ArgRef0 to ArgRef12 objects
  • ArgRefN has an appropriate memory format using #[repr(C)]

  #[repr(C)]
  pub struct ArgRef2<'arg, D1: DeviceSend, D2: DeviceSend> {
   arg1: &'arg D1,
   arg2: &'arg D2,
  }

  This can pass into cuLaunchKernel directory

Change

• Argument parameter of launch changes:

  let result = assert(&ctx, 1 /* grid */, 4 /* block */, &());

  becomes

  let result = assert(&ctx, 1 /* grid */, 4 /* block */, ());
                                                    /*  ^ drop &  */