Add new package Visual Studio Code v1.18.1

vscode.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!--  vim: set softtabstop=3: -->
+<packages>
+  <package id="vscode" name="Visual Studio Code" revision="%version%.1" priority="0" reboot="false">
+    <variable name="version" value="1.18.1" />
+
+    <check type="uninstall" path="Microsoft Visual Studio Code" condition="versiongreaterorequal" value="%version%" />
+
+    <!-- the silent installer defaults to launching the software unless we specify the extra MERGETASKS flag:
+         https://stackoverflow.com/questions/42582230/how-to-install-visual-studio-code-silently-without-auto-open-when-installation
+         https://github.com/Microsoft/vscode/issues/19319 -->
+
+    <install cmd='%software%\microsoft.com\vscode\vscodesetup-x64-%version%.exe /VERYSILENT /MERGETASKS=!runcode ' />
+
+    <upgrade include='remove' />
+    <upgrade include='install' />
+
+    <remove cmd='"%programfiles%\Microsoft VS Code\unins000.exe" /VERYSILENT' />
+
+  </package>
+</packages>