Get rid of Appveyor

.appveyor.yml

@@ -1,34 +0,0 @@
-os: Visual Studio 2015
-
-clone_folder: C:\calibre
-clone_depth: 5
-
-cache:
-    - .build-cache
-    - node_modules -> .appveyor.yml
-
-install:
-    - ps: Install-Product node 7
-    - node --version
-    - npm --version
-    - appveyor-retry npm install --no-optional rapydscript-ng regenerator uglify-js
-    - set PATH=node_modules\.bin;%PATH%
-    - rapydscript --version
-
-environment:
-    SW: C:\sw
-    QMAKE: C:\sw\qt\bin\qmake.exe
-    QT_PLUGIN_PATH: C:\sw\qt\plugins
-
-platform:
-    - x64
-    - x86
-
-before_build:
-  - C:\Python36-x64\python.exe setup/win-ci.py sw
-
-build_script:
-    - C:\sw\private\python\python.exe setup/win-ci.py build
-
-test_script:
-    - C:\sw\private\python\python.exe setup/win-ci.py test