[Editor] Package Manager

[michaelsakharov]

We have a Nuget Package Manager, however, it could be further tested and improved.
And we need to actually make some packages to ensure its working reliably.

• Finish the Manager Itself
• Move Node Graph to Package
• Move Navmesh to Package
• Move Physics to Package

[PaperPrototype]

• Move UI to package

[michaelsakharov]

• Move UI to package

Not quite yet, that's quite a while off since the UI needs to be stripped out and turned into an independently library which would take a while todo first.