CN - 1) Added support for requiring the SwH (AKA Trainer)

 switch to be ON before enabling the range test. This
 feature may be enabled/disabled in the main setup menu and
 will apply to all models. When enabled, a popup box appears
 when the range test feature is turned on that prompts the
 user to turn the Tranier switch ON to enable the range
 test. Added so that the user is less likely to leave the
 range test feature on by accident, and also allows the user
 to easily switch the range test on and off. Only included
 when PCB=TARANIS. Set the compile time option
 SWH_RANGE_TEST=YES to include this functionality. Could be
 used to resolve issue #159.
2) Added support for including '\n' characters in popup box
 messages. Used by the SWH_RANGE_TEST option when displaying
 the range test enable prompt.