v1.2.0: WireGuard VPN data, better link type detection, HAN-FUN/DECT device support

Features:

• adds support for WireGuard VPN #77
• adds support to determine link type based on model number #71
• adds support for HAN-FUN/DECT home automation devices #81
• improves home automation dashboards with more panels for different home automation attributes

Bugfixes:

• fixes issue with incorrect linkuptime #72
• fixes DSL Connection info for version 7.50 #79
• fixes issue with home automation containing only one device #74
• fixes issue with overwriting existing default retention policy #80

Special thanks to @MarcLandis and @matthiasstock for their contributions and all other user for their support in finding and fixing issues.