Remove AppVeyor and Travis configs

.travis.yml

@@ -1,18 +0,0 @@
-dist: xenial
-addons:
-    apt:
-        sources:
-            - ubuntu-toolchain-r-test
-before_install:
-    - sudo apt-get update -qq
-    - sudo apt-get install -y wget libwxgtk3.0-dev libgtk2.0-dev gettext autopoint libasound2-dev alsa-utils alsa-oss
-    - git show -s --format="#define REV_LONG \"%H\"%n#define REV_TIME \"%cd\"%n" | tee ./src/RevisionIdent.h
-    - g++ --version
-    - wget https://github.com/Kitware/CMake/releases/download/v3.17.2/cmake-3.17.2-Linux-x86_64.sh
-    - sh cmake-3.17.2-Linux-x86_64.sh --skip-license
-language:
-    - cpp
-script:
-    - mkdir build
-    - cd build
-    - time ../bin/cmake .. && time make -j2

appveyor.yml

@@ -1,39 +0,0 @@
-#Original script provided by Thomas Feher and subsequently adapted.
-#if you want to work on this, please talk with us on
-# https://lists.sourceforge.net/lists/listinfo/audacity-devel
-#build time is circa 7 mins.
-version: 2.4.2-alpha-{build}
-image: Visual Studio 2017
-shallow_clone: true # reduce traffic
-install:
-    - 'echo #define REV_LONG "%APPVEYOR_REPO_COMMIT%" > src\RevisionIdent.h'
-    - 'echo #define REV_TIME "%APPVEYOR_REPO_COMMIT_TIMESTAMP%" >> src\RevisionIdent.h'
-    # install gettext tool (only used by target "locale", which is not built at
-    # the moment due to long duration
-    - nuget install Gettext.Tools -Version 0.19.8.1 -OutputDirectory %AUDACITY_ROOT%\win\packages
-    # download wxWidgets
-    - git clone --recurse-submodules --branch v3.1.1 --depth 1 --jobs 4 https://github.com/audacity/wxWidgets.git %WXWIN%
-    # build wxWidgets
-    - msbuild /m %WXWIN%\build\msw\wx_vc15.sln "/p:Configuration=DLL Release;Platform=Win32;PlatformToolset=v141" /target:adv,base,core,html,net,qa,wxexpat,wxjpeg,wxpng,wxtiff,wxzlib,xml /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
-environment:
-    WXWIN: '%APPVEYOR_BUILD_FOLDER%\lib-src\wxWidgets'
-    AUDACITY_ROOT: '%APPVEYOR_BUILD_FOLDER%'
-# replace `build_script` with `build` and `configuration` when complete build
-# does not exceed a duration of 1 hour
-#build:
-    #project: win/audacity.sln
-#configuration:
-    #- Release
-build_script: # build all targets except `help`
-- cmd: >-
-    msbuild /m win/audacity.sln /p:Configuration=Release;Platform=Win32;PlatformToolset=v141 /target:expat,filedialog,libflac++,libflac,libid3tag,libmad,libnyquist,libogg,libscorealign,libsndfile,libsoxr,libvamp,libvorbis,lv2,portaudio-v19,portmidi,portmixer,portsmf,sbsms,soundtouch,twolame,Audacity /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" &&
-    del /S win\Release\*.ipdb &&
-    del /S win\Release\*.iobj &&
-    del /S win\Release\*.lib &&
-    del /S win\Release\*.pdb &&
-    del /S win\Release\*.exp &&
-    copy %WXWIN%\lib\vc_dll\*.dll win\Release\
-artifacts:
-- path: win\Release
-  name: 'audacity-%APPVEYOR_BUILD_VERSION%-%APPVEYOR_REPO_COMMIT%'
-