No Visual Studio 2017 support in Windows-MSVC.cmake, FindwxWidgets.cmake and InstallRequiredSystemLibraries.cmake
Following issues were found:
* `MSVC15` was not defined in `Windows-MSVC.cmake`. MS C++ compiler versions:
* VS2017 - 19.10
* VS2015 - 19.00
* Add `MSVC15` conditions in `FindwxWidgets.cmake`:
```
...
if(MSVC15)
set(_WX_TOOLVER 141)
elseif(MSVC14)
...
```
* Add `MSVC15` conditions in `InstallRequiredSystemLibraries.cmake`:
```
if(MSVC15)
MSVCRT_FILES_FOR_VERSION(15)
endif()
...
if(MSVC15)
MFC_FILES_FOR_VERSION(15)
endif()
...
if(MSVC15)
OPENMP_FILES_FOR_VERSION(15 141)
endif()
...
```
issue