Use GitHub Actions as CI service (#5602)

* ci: migrate to GitHub Actions

* ci: linux-mingw: use lief for parsing PE files

* ci: fix left-over issues with clang-format check

* ci: workaround libc++ issue on macOS

* appveyor: remove build scripts

* README: add GitHub Actions badge and ...

remove Travis CI and Appveyor badges

.ci/transifex/docker.sh

@@ -0,0 +1,39 @@
+#!/bin/bash -e
+
+# Setup RC file for tx
+cat << EOF > ~/.transifexrc
+[https://www.transifex.com]
+hostname = https://www.transifex.com
+username = api
+password = $TRANSIFEX_API_TOKEN
+EOF
+
+
+set -x
+
+cat << 'EOF' > /usr/bin/tx
+#!/usr/bin/python3
+
+# -*- coding: utf-8 -*-
+import re
+import sys
+
+from txclib.cmdline import main
+
+if __name__ == '__main__':
+    sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
+    sys.exit(main())
+EOF
+
+echo -e "\e[1m\e[33mBuild tools information:\e[0m"
+cmake --version
+gcc -v
+tx --version
+
+mkdir build && cd build
+cmake .. -DENABLE_QT_TRANSLATION=ON -DGENERATE_QT_TRANSLATION=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SDL2=OFF
+make translation
+cd ..
+
+cd dist/languages
+tx push -s