Provide more support for Qt in VS Code

We had a customer who was very turned off by some of the Qt Creator design and bugs. They were asking about Qt support in Vs Code. Here was their feedback:

Solid vim support, QML auto-completion and Qt specific code generation are the main things missing from VS code for us.  If that were in place, most of what we need would be there.  As mentioned in that article, some things about qtcreator are actually better, but the list seems to be small.  The ability to define a header file and then generate a stubbed implementation is missing in vs code, but present in qtcreator for example.  The ability to generate a generic QObject based class is another example where qtcreator is better.  These are small examples, but make a difference.  On the plus side for vs code, vs code has much better vim integration and has a huge number of extensions to take advantage of.  It also feels more polished and modern.  There are a ton of nice features like live share and really solid git integration.