Remove appveyor

Fails too often randomly anyway.

appveyor.yml

@@ -1,26 +0,0 @@
-version: '{build}'
-pull_requests:
-  do_not_increment_build_number: true
-environment:
-  matrix:
-    - PYTHON: "C:\\Python38-x64\\python.exe"
-      PYTHON_VERSION: "3.8"
-install:
-  - cmd: "%PYTHON% -m pip install --upgrade pip"
-  - cmd: "%PYTHON% -m pip install -r requirements.txt --upgrade"
-  - cmd: "%PYTHON% -m pip install --upgrade cx_Freeze"
-build_script:
-  - cmd: "%PYTHON% setup.py build_exe"
-artifacts:
-  - path: "build\\exe.win-amd64-%PYTHON_VERSION%\\"
-    name: "Berserker_Multiworld_%APPVEYOR_REPO_BRANCH%_Python%PYTHON_VERSION%-x64"
-deploy:
-  description: 'Appveyor automated build'
-  provider: GitHub
-  auth_token:
-    secure: +cRWefLphFutZuzCcCsNS0tl7nNj/IpnJmfht6hZFh2z9eQdFgcu6zwGS3lWItat
-  artifact: /.*\.zip/
-  draft: false
-  prerelease: false
-  on:
-    APPVEYOR_REPO_TAG: true        # deploy on tag push only