Add AppVeyor build files

appveyor.yml

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+image: Visual Studio 2017
+
+platform: x64 #CUDA stuff seems to only be available on x64
+
+environment:
+  matrix:
+    - target: x64
+    - target: Win32
+
+configuration: Release
+
+# on_finish:
+#   - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
+before_build:
+- cmd: call install-cuda.cmd
+
+build_script:
+  cmd: |
+    cmake -G "Visual Studio 15 2017" -A %target% .
+    cmake --build . --config Release
+    cd bl_flip_fluids
+    7z a flip_fluids_addon.zip flip_fluids_addon
+
+test: off
+
+artifacts:
+  - path: bl_flip_fluids/flip_fluids_addon.zip
+    name: Addon zip

install-cuda.cmd

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+@echo off
+rem stolen from https://github.com/willyd/appveyor-cuda-test - thanks man
+echo Downloading CUDA toolkit 10
+appveyor DownloadFile  https://developer.nvidia.com/compute/cuda/10.0/Prod/local_installers/cuda_10.0.130_411.31_win10 -FileName cuda_10.0.130_411.31_win10.exe
+echo Installing CUDA toolkit 10
+cuda_10.0.130_411.31_win10.exe -s nvcc_10.0
+
+dir "%ProgramFiles%"
+dir "C:\Program Files"
+dir "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA"
+dir "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.0"
+dir "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.0\bin"
+
+set PATH=%ProgramFiles%\NVIDIA GPU Computing Toolkit\CUDA\v10.0\bin;%PATH%
+
+nvcc -V