cmake obs-frontend-api examples

WarmUpTill/SceneSwitcher cmake/common/advss_helpers.cmake :259 

find_package(obs-frontend-api)

royshil/obs-backgroundremoval CMakeLists.txt :20 

find_package(obs-frontend-api REQUIRED)

iamscottxu/obs-rtspserver external/BuildHelper.cmake :36 

find_package(obs-frontend-api REQUIRED)

exeldro/obs-transition-table CMakeLists.txt :26 

find_package(obs-frontend-api REQUIRED)