WlanHelper 0.01: Added command line API support

WlanHelper is used to set/get the operation mode for a wireless adapter on Windows.

Interactive way:

Run WlanHelper without parameters.

Command-line API way:

1. Run netsh wlan show interfaces, get the GUID for the interface.
2. Run WlanHelper -h to see the usage. {Interface Name} refers to the GUID in the above step.

Command Usage:
WlanHelper {Interface Name} mode [*null*|managed|monitor]
*null* - get interface mode
managed - set interface mode to managed mode (aka ExtSTA)
monitor - set interface mode to monitor mode (aka NetMon)