feat: add frame_converter and provide consumers opaque frame type#1609

Julusian wants to merge 3 commits intoCasparCG:masterCasparCG/server:masterfrom

Julusian:feat/shader-conversions-1-frame-converterJulusian/CasparCG-Server:feat/shader-conversions-1-frame-converterCopy head branch name to clipboard