Implement command "Group Control" (32)

[rzbrk]

Implement command "Group Control" (32), see: https://github.com/rzbrk/VoiceRecognitionV3#group-control-32

The command actually consists of multiple sub-commands:

• 32-00: group select --> ''set_group_mode()''
• 32-01 set_user_group()
• 32-02: load_system_group()
• 32-03: load_user_group()
• 32-04: check_user_group()