Ability to send SAFETY_ARMINGSTATUS_STATUS_DISARMED message

[reilly-callaway]

ESC Panel window can broadcast STATUS_FULLY_ARMED status to "enable" any ESCs that respect the ArmingStatus message, but there's currently no way to test the behaviour of disarming ESCs with the disarmed status.

UI possibly just looks like two radio buttons for "ARMED" and "DISARMED" in addition to the existing "Send Arming" checkbox?

[dmokel]

Hi, this issue has been fixed at #97