Allow Femto Mega firmware upgrade on Windows

[KubaAtFrenchTouchFactory]

Currently only Linux systems support firmware upgrades for Femto Mega devices. Adding the possibility to upgrade the firmware of the camera from the windows build of the OrbbecViewer would be much appreciated.

[zzuliys]

Femto Mega cannot be upgraded on Windows

Currently only Linux systems support firmware upgrades for Femto Mega devices. Adding the possibility to upgrade the firmware of the camera from the windows build of the OrbbecViewer would be much appreciated.