Build Mac app

[chen3feng]

See UBT for reference:

Engine/Source/Programs/UnrealBuildTool/Platform/Mac/MacToolChain.cs

./Intermediate/Build/Mac/x86_64/TestClient/Development/FinalizeAppBundle.sh

#!/bin/sh
cd "/Users/cf/Documents/Work/PbTest/Binaries/Mac"
mkdir -p "TestClient.app/Contents/MacOS"
mkdir -p "TestClient.app/Contents/Resources"
rsync --checksum "/Users/cf/Documents/Work/UnrealEngine/Engine/Source/Runtime/Launch/Resources/Mac/UnrealEngine.icns" "TestClient.app/Contents/Resources/TestClient.icns"
rsync --checksum "/Users/cf/Documents/Work/UnrealEngine/Engine/Source/Runtime/Launch/Resources/Mac/Info.plist" "$TMPDIR/TempInfo.plist"
/usr/bin/sed -i "" -e "s/\${EXECUTABLE_NAME}/TestClient/g" "$TMPDIR/TempInfo.plist"
/usr/bin/sed -i "" -e "s/\${APP_NAME}/com.YourCompany.TestClient/g" "$TMPDIR/TempInfo.plist"
/usr/bin/sed -i "" -e "s/\${MACOSX_DEPLOYMENT_TARGET}/10.15.7/g" "$TMPDIR/TempInfo.plist"
/usr/bin/sed -i "" -e "s/\${ICON_NAME}/TestClient/g" "$TMPDIR/TempInfo.plist"
/usr/bin/sed -i "" -e "s/\${BUNDLE_VERSION}/5.1.1/g" "$TMPDIR/TempInfo.plist"
rsync --checksum "$TMPDIR/TempInfo.plist" "TestClient.app/Contents/Info.plist"
chmod 644 "TestClient.app/Contents/Info.plist"
mkdir -p "/Users/cf/Documents/Work/Test/Intermediate/Mac"
rsync --checksum "$TMPDIR/TempInfo.plist" "/Users/cf/Documents/Work/Test/Intermediate/Mac/TestClient-Info.plist"
chmod 644 "/Users/cf/Documents/Work/Test/Intermediate/Mac/TestClient-Info.plist"
echo 'echo -n "APPL????"' | bash > "$TMPDIR/TempPkgInfo"
rsync --checksum "$TMPDIR/TempPkgInfo" "TestClient.app/Contents/PkgInfo"
touch -c "TestClient.app"