add support for appveyor 64 bit windows builds

appveyor.yml

@@ -1,59 +1,81 @@
 version: 0.0.0.{build}
 image: Visual Studio 2017
 
-# TODO use "Visual Studio 15 2017 Win64" for 64 bit builds 
 
-artifacts:
-    - path: artifacts_core
-      name: sourcetraildb_core_windows_32bit_$(appveyor_build_version)
-      type: Zip
-    - path: artifacts_bindings_python
-      name: sourcetrailbd_python_windows_32bit_$(appveyor_build_version)
-      type: Zip
-      
+environment:
+    matrix:
+        - ARCHITECTURE: 32bit
+          PYTHON_PATH: C:/Python37
+        - ARCHITECTURE: 64bit
+          PYTHON_PATH: C:/Python37-x64
+
+
 install:
     - ps: |
+        if ($env:ARCHITECTURE -eq "32bit") {
+            echo "Architecture set to 32 bit."
+            $env:CMAKE_GENERATOR="Visual Studio 15 2017"
+        } elseif ($env:ARCHITECTURE -eq "64bit") {
+            echo "Architecture set to 64 bit."
+            $env:CMAKE_GENERATOR="Visual Studio 15 2017 Win64"
+        } else {
+            echo "No architecture set. Falling back to 32 bit build."
+            $env:ARCHITECTURE="32bit"
+            $env:CMAKE_GENERATOR="Visual Studio 15 2017"
+        }
+        
         # Install SWIG by Choco
         choco install -y --no-progress swig
 
+
 before_build:
     # Setup core project
     - cd core
     - mkdir build
     - cd build
-    - mkdir 32bit
-    - cd 32bit
-    - cmake -G "Visual Studio 15 2017" ../..
+    - mkdir %ARCHITECTURE%
+    - cd %ARCHITECTURE%
+    - cmake -G "%CMAKE_GENERATOR%" ../..
     - cd ../../..
     # Setup bindings_python project
     - cd bindings_python
     - mkdir build
     - cd build
-    - mkdir 32bit
-    - cd 32bit
-    - cmake -G "Visual Studio 15 2017" ../.. -DPYTHON_INCLUDE_DIRS="C:/Python37/include" -DPYTHON_LIBRARIES="C:/Python37/libs/python37.lib"
+    - mkdir %ARCHITECTURE%
+    - cd %ARCHITECTURE%
+    - cmake -G "%CMAKE_GENERATOR%" ../.. -DPYTHON_INCLUDE_DIRS="%PYTHON_PATH%/include" -DPYTHON_LIBRARIES="%PYTHON_PATH%/libs/python37.lib"
     - cd ../../..
-    
+
+
 build_script:
-    - cd core/build/32bit
+    - cd core/build/%ARCHITECTURE%
     - msbuild /p:configuration=Release /v:m ALL_BUILD.vcxproj
     - cd ../../..
-    - cd bindings_python/build/32bit
+    - cd bindings_python/build/%ARCHITECTURE%
     - msbuild /p:configuration=Release /v:m ALL_BUILD.vcxproj
     - cd ../../..
-    
+
+
 after_build:
     - mkdir artifacts_core
     - cd artifacts_core
     - mkdir lib
     - mkdir include
-    - cd ..        
+    - cd ..
     - ps: |
-        copy core/build/32bit/release/sourcetraildb.lib artifacts_core/lib/
-        copy core/build/32bit/include/version.h artifacts_core/include/
+        copy core/build/$env:ARCHITECTURE/release/sourcetraildb.lib artifacts_core/lib/
+        copy core/build/$env:ARCHITECTURE/include/version.h artifacts_core/include/
         copy core/include/* artifacts_core/include/
     - mkdir artifacts_bindings_python
     - ps: |
-        copy bindings_python/build/32bit/release/_sourcetraildb.pyd artifacts_bindings_python/
-        copy bindings_python/build/32bit/release/sourcetraildb.py artifacts_bindings_python/
-    - echo All done!
+        copy bindings_python/build/$env:ARCHITECTURE/release/_sourcetraildb.pyd artifacts_bindings_python/
+        copy bindings_python/build/$env:ARCHITECTURE/release/sourcetraildb.py artifacts_bindings_python/
+
+
+artifacts:
+    - path: artifacts_core
+      name: sourcetraildb_core_windows_%ARCHITECTURE%_$(appveyor_build_version)
+      type: Zip
+    - path: artifacts_bindings_python
+      name: sourcetrailbd_python_windows_%ARCHITECTURE%_$(appveyor_build_version)
+      type: Zip