[OBSOLETE] Remotec ZRC-90 Scene Master - Button Device Supporting 24 Unique Button Commands (see post 177 for 2021 app version)

The DTH needs to be updated to follow new documentation additions, namely - if I remember correctly - a numberOfButtons attribute exposing the number of buttons. CoRE will respect that and show as many buttons as declared, or four if that info does not exist.

@erocm1231 would you be able to add the required attribute and initialize it to what looks like 16? 8 pushed/held plus another 8 pushed for the double click. I could add double click to CoRE but it would break its compliance with documentation…