* Build: Enable and require c++17
* Build: Raise Visual Studio version from 2017 15.2 to 2017 15.9
* Build: Raise GCC version from 6.3.0 to 7.1.0
* Reduce branch differences
* Fix build after latest merge
* Cleanup after latest merge
* Required for handling flags inherited by linked projects
correctly in the corresponding precompiled header.
* Reduces the maintenance effort for precompiled headers
* Remove the usage of global flags and definitions
set through the CMAKE_CXX_FLAGS variable.
* Use cmake target compile features for setting the
CXX standard automatically.
* Make C++14 globally available in the project
* Closes#21033
