Add support for loading and exporting projects via the File System Access API

[vezwork]

Description

On the project project details panel, add the functionality to open a project file from the user's file system and save the project to a file on the user's file system. The File System Access API provides a nicer user experience because it allows them to use a system dialog to open and save files. If a project file is open then pressing save can overwrite the currently open project file.

Reference

• File System Access API on MDN
  • warning: This API is not available in all browsers (no firefox).