[cpp] add socket polling api

git-svn-id: http://haxe.googlecode.com/svn/trunk@6207 f16182fa-f095-11de-8f43-4547254af6c6
Allow toString to be set Dynamically

git-svn-id: http://haxe.googlecode.com/svn/trunk@6208 f16182fa-f095-11de-8f43-4547254af6c6