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](https://github.com/rapid7/metasploit-framework/pull/2592) too)