v0.12b1

Main changes

• Support Bluetooth Mesh Switches @hellkun
• Support receive LAN key for lumi.gateway.v3

Other changes

• Add optional basic logs
• Add delay of receiving MQTT msg to logs
• Update Chinese translation @NathanDai @bluefoxlee
• Remove python-miio from requirements
• Fix broken raw zigbee messages
• Fix device identifier with one element