[Development] Use RAII for non-pointer resources

[Denis Shienkov]

Hi all,

what do you think about using of RAII, e.g. for:

* Windows: for HANDLE, HKEY and so on.
* POSIX: for fd and so on.
* OSX: for io_registry_entry_t and so on.

??

As we use C++11 now everywhere, then, maybe can be to add appropriate
RAII functionality e.g. to qcore_unix_p.h, qcore_win_p.h, qcore_mac_p.h
files?

Please see:

[1]
http://stackoverflow.com/questions/22775500/is-there-any-raii-file-handle-already-implemented
[2]
http://stackoverflow.com/questions/24611215/one-liner-for-raii-on-non-pointer
[3]
http://stackoverflow.com/questions/14841396/stdunique-ptr-deleters-and-the-win32-api

and soo on. :)

BR,
Denis
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