Commands for 2.position ON/OFF switches

[LeCuvier]

There is a number of commands that require 2 pushbuttons each, although the real thing has only one maintained switch. Please add the following lines to "default.lua" and "Throttle - HOTAS Warthog.lua":

{down = device_commands.Button_5, up = device_commands.Button_7, cockpit_device_id  = devices.CONTROL_SYSTEM, value_down = 1.0, value_up = 1.0, name = _('Landing Gear 2-Pos RETRACT/EXTD'), category = _('Systems')},
{down = device_commands.Button_6, up = device_commands.Button_6, cockpit_device_id = devices.CONTROL_SYSTEM, value_down = 1.0, value_up = 0.0, name = _('Landing Gear Retraction Cover 2-Pos UP/DOWN'), category = _('Systems')},
{down = iCommandLeftEngineStop, up = iCommandLeftEngineStart, name = _('Throttle 2-Pos. OFF/IDLE'), category = _('Engine Control')},
{down = device_commands.Button_13, up = device_commands.Button_26, cockpit_device_id  = devices.ELEC_INTERFACE, value_down = 1.0, value_up = 1.0, name = _('CB Navigation Lights 2-Pos. ON/OFF'), category = _('Electric System')},
{down = device_commands.Button_4, up = device_commands.Button_4, cockpit_device_id = devices.PILOT_SIGHT, value_down = 1.0, value_up = 0.0, name = _('Gun Sight Tint 2-Pos ON/OFF'), category = _('REVI 16 B Gunsight')},

In the case of the engine cutoff that's really a MUST as the TM WH throttle has only a single contact.