add exitAdminMode function
Fixed non working admin mode timeout
renamed dtmfState with adminState
Added debug timestamp every minute
Do not activate repeater in admin mode
Allow admin mode to be entered when repeater is opened
Refactored code to add flexibility into the admin mode
Changed message issued on authentication error
Shortened DTMF buffer auto clear
Changed default message on enable and disable
Add a parameter to called functions
Added morse sending for analog values