Migrate project list to separate config file.

Storing the project/favorites list in the EditorSettings makes it
difficult to version-control your editor configuration, as the file will
continually change as you open new projects. It also means a
configuration can't be shared across machines, as they might not have
the same projects or file layout.

Now the project list is stored in $godot_data_dir/projects.cfg.
Each path is a section, which has a boolean favorite value.
If the new config does not exist, the editor attempts to migrate legacy
EditorSettings-based configuration to the new file.

Fixes godotengine/godot-proposals#1637.

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