mcd v1.0

First release under new stewardship.

Changes

• Project forked and renamed to mcd
• Add JSON output support
• Renamed setting proxy-queries to proxy-mode, compat
  for old setting name remains
• Use lower-case characters for MAC addresses
• Update documentation, missing iface settings

Fixes

• Allow fallback to proxy mode if interface has no address
• Fix coding style
• Fix build warnings