v5.2.1 - small fixes around FFMPEG

What's Changed

• fix ffmpeg arguments during concat. by @TheGreatCodeholio in #1120
• Fix minor spelling/markdown in docs by @jameson-dev in #1119
• fix(simplestream): dangling pointer in sendJSON length prefix by @LumenPrima in #1107
• Fix ffmpeg args by @TheGreatCodeholio in #1122
• Enable simplestream plugin in CMakeLists by @Dygear in #1121

New Contributors

• @jameson-dev made their first contribution in #1119

Full Changelog: v5.2.0...v5.2.1