Set minimum required CMake version to 3.16.0
This gets rid of some warnings:
CMake Warning (dev) at /usr/share/ECM/modules/ECMFindModuleHelpers.cmake:112 (message):
Your project should require at least CMake 3.16.0 to use FindKF5.cmake
Call Stack (most recent call first):
/usr/share/ECM/find-modules/FindKF5.cmake:30 (ecm_find_package_version_check)
CMakeLists.txt:31 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at app/CMakeLists.txt:2 (add_executable):
Policy CMP0063 is not set: Honor visibility properties for all target
types. Run "cmake --help-policy CMP0063" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.
Target "AuraBrowser" of type "EXECUTABLE" has the following visibility
properties set for CXX:
CXX_VISIBILITY_PRESET
VISIBILITY_INLINES_HIDDEN
For compatibility CMake is not honoring them for this target.
This warning is for project developers. Use -Wno-dev to suppress it.
Edited by Bart Ribbers