lookup for mode number

[ste7anste7an]

https://github.com/antonvh/PUPRemote/blob/7cffd7331b237a5f96c6d25186238bdeab2b913b/LPF2/pupremote.py#L61

When a message from the hub is received by the pup, it needs to lookup the command that belongs to that mode. Therefore, we need an index of the commands indexes by mode.

Proposal:

• add a new list: self.mode_command=[] to the __init__ function

  self.mode_command.append(mode_name)

[ste7anste7an]

Implemented in new code