v2.0-alpha.4

Main changes

• Many improvements in the specification of Aqara and Xiaomi devices
• Adds internal available logic to all devices (Zigbee, BLE, Mesh)
• Adds internal ping logic to main powered devices
• Adds support Zigbee binding

Other changes

• Adds last_msg to BLE stats
• Adds support binding for Aqara Opple
• Adds Look Door Lock model (BLE) #598
• Rewrite Aqara Door Lock S2 support
• Rewrite Aqara Cube support
• Move zigbee config functionality to converters
• Move other gateway commands to main dropdown
• Remove migration logic
• Fix LeMesh Mesh lights models #580
• Fix illumination data for old Aqara Motion Sensor