VS2019 is binary compatible with the existing vc14 libraries and no
new libraries libs are required in svn.
VS2019 support requires cmake 3.14.
VS2019 is still in pre-release state, you are required to explicitly
select the pre-release version by using:
make full 2019pre
make.bat was starting to become hard to maintain, this refactors it into separate batch files for each stage of the process.
-Improved detection of msvc2013/2015
-Improved failure handling.
-Added check for working msbuild and C++ compiler
-Added verbose switch to ease trouble shooting.
-Added Check if svn/cmake/git are in the path before using them
-Display the build configuration before asking to download the libraries
-Offer an option to recover an interrupted checkout of the libraries.
-Automatically check out sub-modules in-case they are missing.
