message: Update windows script to support VS 16 2019
diff: @@ -144,6 +144,10 @@ echo Setup will continue with the configuration: %config_type%
  ::check if the generator is correct
  set /a opt=0
  set vs=15
  +if %generator%=="Visual Studio 16 2019" (
  + set /a opt=1
  + set vs=15
  +)
  if %generator%=="Visual Studio 15 2017 Win64" (
  set /a opt=1
  set vs=15
  @@ -159,7 +163,7 @@ if %set_generator%==0 (
  set vs=15
  )
  if %opt%==0 (
  - echo Please enter a correct configuration ("Visual Studio 15 2017 Win64" or "Visual Studio 14 2015 Win64"^)
  + echo Please enter a correct configuration ("Visual Studio 16 2019"; "Visual Studio 15 2017 Win64" or "Visual Studio 14 2015 Win64"^)
  EXIT /B %ERRORLEVEL%
  )
  echo Setup will continue with the generator: %generator%
  @@ -232,6 +236,7 @@ ECHO Specify the directory where the dependencies will be downloaded.
  ECHO -i^|--depsinstalldir
  ECHO Specify the directory where the dependencies will be installed.
  ECHO -g^|--generator
  +ECHO Visual Studio 16 2019 = Generates Visual Studio 2019 project files.
  ECHO Visual Studio 15 2017 Win64 = Generates Visual Studio 2017 project files.
  ECHO Visual Studio 14 2015 Win64 = Generates Visual Studio 2015 project files.
  ECHO -c^|--configuration
  