Implement COM objects properly (for instance, App)

[cocus]

I don't have enough time to continue with this project at this time, but I'd like to ask for help about implementing the COM objects properly.
My current implementation is a hacked up solution that doesn't work and it doesn't follow COM standards. I understand that MSVC can create COM classes by just defining the virtual tables inside the C++ sources (similarly to https://github.com/valinet/ExplorerPatcher/blob/master/ExplorerPatcher/StartMenuSettings.cpp#L67C36-L67C36).
I also don't know how the DllGetClassObject works inside a COM dll, thus my "factory" code is probably not right.
This is fundamental for the other stuff to work, like VB classes; which also require further investigation on how to properly create a COM object and probably provide a wrapper around them.
Any help would be greatly appreciated. It doesn't need to be in the form of pull requests, any conversations on this issue would suffice. Thank you!