Msfconsole suspend and RM7223

This fully [fixes RM7223] and adds the suspend command to the meterpreter
interface.
Suspend allows you to suspend and resume running processes on the
targethost.  It was originally written as a post module (and the dll
version will be submitted as such later), but egypt suggested I add it
to meterpreter.  Tested on Win7 32 & 64bit (tho it's really Win OS independent as it uses the meterpreter api, not the WinAPI or shell commands etc)