Version 0.21.0

Features

• Server: Support for WebSocket streaming clients
• Server: Install Snapweb web client (Issue #579)
• Server: Resample input to 48000:16:2 when using opus codec
• Server: Add Alsa stream source

Bugfixes

• make install will setup the snapserver home dir (Issue #643)
• Client retries to open a blocked alsa device (Issue #652)

General

• debian packag generation switched from make to CMake buildsystem
• Reintroduce MACOS define, hopefully not breaking anything on macOS
• Snapcast uses GitHub actions for automated CI/CD
• CMake installs man files (Issue #507)
• Update documentation (Issue #615, #617)