Merge branch 'add-missing-find-package-opencv' into 'master'

Add find_package(OpenCV) required on Ub20 when building OpenCV from source

See merge request ArmarX/skills/navigation!8

CMakeLists.txt

@@ -25,6 +25,7 @@ armarx_find_package(PUBLIC Ceres QUIET)
 # Optional dependencies
 armarx_find_package(PUBLIC VTK)
 armarx_find_package(PUBLIC SemanticObjectRelations QUIET)
+armarx_find_package(PUBLIC OpenCV QUIET)  # Required as RobotAPI is a legacy project.
 
 
 #include(FetchContent)