Add support for VKB NXT Evo diagrams exported from Star Citizen

[dopeghoti]

The sticks are functionally identical, but the device names are different. I was able to mostly use the exported XML by changing the name of the device from e. g.

 <options type="joystick" instance="2" Product=" VKBsim Gladiator EVO  L    {0201231D-0000-0000-0000-504944564944}"/>

to

 <options type="joystick" instance="2" Product=" VKB-Sim Gladiator NXT L   {0201231D-0000-0000-0000-504944564944}"/>

However, the throttle, X, Y, and Z axes' bindings to not appear to be properly parsed:

In my bindings' case, the relevant XML for these bindings are:

  <action name="v_pitch">
   <rebind input="js3_y"/>
  </action>
  <action name="v_roll">
   <rebind input="js3_x"/>
  </action>
  <action name="v_strafe_lateral">
   <rebind input="js2_x"/>
  </action>
  <action name="v_strafe_longitudinal">
   <rebind input="js2_y"/>
  </action>
  <action name="v_strafe_vertical">
   <rebind input="js2_rotz"/>
  </action>
  <action name="v_yaw">
   <rebind input="js3_rotz"/>
  </action>