Add webcam livestream feature for meterpreter

[SeeRM #8729] - This meterpreter command allows the attacker to observe the target at real-time
by turning their webcam live. There is also a HTML-based player provided, which does not require
a plugin or anything, just open it with a browser. The HTML-based player also allows the attacker
to put livestream on the web (evil? yeah, kind of.)
Incorrect variable used
Land #2814, streaming webcam STDAPI add