Add .proto files to the editor

It's beneficial for the editor scripts to have the .proto definitions available, in order to correctly load/save files in our file formats.

We could bundle the .proto files in a zip, which is then bundled with the editor, and subsequently unpacked at startup.

Since the files are small, they could be stored as-is as well.

Start by locating the editor scripts, the current editor bundling path, and the startup code that could provide the .proto definitions. Compare bundling the files as-is with a zip archive; done means the definitions are available after startup and the editor can correctly load and save the affected file formats.

Written by the indexing model from the issue text.