Remove AppVeyor CI

.appveyor.yml

@@ -1,46 +0,0 @@
-version: 1.0.{build}
-
-branches: 
-  only:
-    - master
-
-environment:
-  global:
-    APPVEYOR_OS_NAME: windows
-  matrix:
-  #MSYS2 Building
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      platform: x86
-      BUILDER: MSYS2
-
-  #VisualStudio Building
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      platform: x86
-      BUILDER : VS
-      BITS: 32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      platform: x64
-      BUILDER : VS
-      BITS: 64
-
-configuration: Debug
-shallow_clone: true
-clone_depth: 5
-
-init:
-- set MSYS2_PATH=c:\msys64
-- set CHERE_INVOKING=1
-- if "%BUILDER%_%PLATFORM%"=="MSYS2_x86" set MSYSTEM=MINGW32
-- if "%BUILDER%_%PLATFORM%"=="MSYS2_x64" set MSYSTEM=MINGW64
-- '%MSYS2_PATH%\usr\bin\bash -lc "pacman --noconfirm -S --needed unzip rsync"'
-- if "%BUILDER%"=="VS" set PATH=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin;%PATH%
-
-install:
-- cd ..
-- git clone --depth=1 --branch=master https://github.com/openframeworks/openFrameworks
-- call openFrameworks\scripts\ci\addons\install.cmd
-
-build_script:
-- cd %OF_PATH%
-- scripts\ci\addons\build.cmd
-