began rewriting appveyor script

appveyor-build.bat

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+REM Set up Visual C++ envs
+call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64
+call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86_amd64
+
+REM Install FFmpeg
+vcpkg install ffmpeg
+
+REM Install OpenColorIO
+
+REM Install OpenImageIO
+vcpkg install openimageio
+
+REM Run cmake
+cmake . -G "NMake Makefiles"
+
+REM Run nmake
+nmake
+
+REM Dependencies are installed, time to set up packages
+powershell $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
+REM Store the Git hash as a variable
+git rev-parse --short=7 HEAD > shorthash.txt
+set /p HASH= < shorthash.txt
+git rev-parse HEAD > longhash.txt
+set /p TRAVIS_COMMIT= < longhash.txt
+
+REM First, we create the installer
+copy packaging\windows\nsis\* .
+"C:\Program Files (x86)\NSIS\makensis.exe" /V4 /DX64 "/XOutFile Olive-%HASH%-Windows-%ARCH%.exe" olive.nsi
+
+REM Next we create the portable version, which we'll need a "portable" file for
+copy /b NUL olive\portable
+
+REM Package the portable version into a zip
+"C:\Program Files\7-Zip\7z.exe" a "Olive-%HASH%-Windows-%ARCH%.zip" "olive"
+
+REM We're done!

appveyor.yml

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+version: {build}
+branches:
+  only:
+  - master
+image: Visual Studio 2015
+environment:
+  TRAVIS_REPO_SLUG: olive-editor/olive
+  matrix:
+  - MSYSTEM: MINGW64
+    QTDIR: 5.12\mingw73_64
+    ARCH: x86_64
+    QTTOOLS: Tools\mingw730_64
+    NSISDEF: /DX64
+#  - MSYSTEM: MINGW32
+#    QTDIR: 5.12\mingw73_32
+#    ARCH: i686
+#    QTTOOLS: Tools\mingw730_32
+build_script:
+- cmd: appveyor-build.bat
+artifacts:
+- path: Olive*.zip
+  name: Olive Portable
+- path: Olive*.exe
+  name: Olive Installer