Add `getproxy` command

This command pulls out system proxy details on windows machines.
Updated meterpreter binaries

Includes the following changes:

* Security cleanup - remove use of insecure functions
* Windows 8/8.1/2012 R2 support to sysinfo
* VS 2013 upgrade
* Command dispatcher refactor
* Getproxy command added (needs MSF side too)
Add another default owa url

Its not default, but not uncommon to find /exchange/ NTLM protected
Land #2592, add getproxy

Needed for new functionality in #2612
Land #2612, Update meterpreter bins

Not only does this happen to fix a recently discovered bug in running
some post modules, but this updates Meterpreter bins to the
latest generated set, which includes the VS2013 conversion.

[FixRM #8628]
Land #2592 and #2612

  * Adds getproxy support (required by new functionality in #2612)
  * Rebuilt binaries with VS2013 (slightly smaller).
Land #2614, another default OWA URL