Clean Up Top Level Folder

[samdeane]

I wonder if we could make a new top-level directory and move a lot of clutter in there, so that the top level is a bit cleaner.

I call this folder "Extras" in my projects, but other names are available...

Specifically, aiming for a layout more like this:

LICENSE.md
README.md
Package.swift
Makefile

Sources/
  SwiftGodot/
  Generator/    <-- move the generator source in here too
  etc...

Plugins/

Tests/

Extras/
  Docs/
    WINDOWS_BUILD.md
    generated docs in here too?

  Testbed/

  TestEditor/

  Scripts/

  Support/
    Generator.xcodeproj   <-- move this out of the top level Generator folder?