Story: Split STLVault into library service and the main application

[rubenwe]

Unity is a great solution for displaying and rendering 3D content. The GUI system is workable and performs well enough with respect to it being cross platform. There are however some major issues that I've run into up to this point:

• Limited support for "Long Paths" (see #42, #52)
• Access Violations when using FileSystemWatcher components
• High CPU usage while idle (#18)
• CI builds are super heavy weight
• NuGet support is not there and many features like reading (non-zip) archives require some external components

There are also some scenarios where people would love to access DBs on other PCs in the local network (#8 )

Because of those aspects I'm exploring ways to split the library from the main application. There is no concrete plan yet, but this might have to happen sooner rather than later.