Improvements to C++ lib

[caesay]

Future improvements:

• Qt should have some special support, eg. AutoUpdate from the Qt sample built in
• Eventually, the Vfusion binary logic is going to get moved into Update.exe, which is already distributed with your app automatically, so you don't need to bring that binary yourself.
• Add CMake scripts and distribute it on vcpkg so it's easy for developers to install and update.

Compile the sample:

• Qt installed somewhere on your computer (use this: https://github.com/miurahr/aqtinstall)
• configure with cmake giving it instructions where Qt libs are
• build
• "install"
• vpk pack
• test

In a c++ cmake project, extending it with libraries is pretty much:

1. add library repo as submodule
2. Add 1-2 commands in parent cmake to embed/compile library statically or dynamically

3. include

4. PROFIT!

With vcpkg it's the same except without the first step.