Split shell script into one each for Python version

create-visual-studio-solution.sh → create-visual-studio-solution-python37.sh

 #!/bin/sh
 
-mkdir build
-cd build
-"C:\Program Files\CMake\bin\cmake" .. -G "Visual Studio 15 Win64"
+mkdir build37
+cd build37
+"C:\Program Files\CMake\bin\cmake" .. -G "Visual Studio 15 Win64" -DPYTHON_EXECUTABLE:FILEPATH="C:/Program Files/Python37/python.exe"

create-visual-studio-solution-python38.sh

+#!/bin/sh
+
+mkdir build38
+cd build38
+"C:\Program Files\CMake\bin\cmake" .. -G "Visual Studio 15 Win64" -DPYTHON_EXECUTABLE:FILEPATH="C:/Program Files/Python38/python.exe"
+