Optional monitors suggestion

[Yuriy via Digitalmars-d]

On Wednesday, 14 May 2014 at 14:44:07 UTC, Marc Schütz wrote:
> The object's layout and size also change, but the layout of 
> objects is implementation defined AFAIK, and its size shouldn't 
> be hard-coded anyway, so the breakage is minimal.
You're right. Shared libraries will need to be rebuilt.

Meanwhile, i've updated the PRs according to latest notes. 
@monitor attr, forbid __monitor declaration, so everyone can have 
some fun with it. =)