Godot-proposals: Allow to load a folder into filesystem in runtime, like it is already possible with .zip/.pck

[IlyaStuurFedorov]

Describe the project you are working on:
Game with a big emphasis on modding.
Describe the problem or limitation you are having in your project:
There is no way to load up folders in engine's filesystem like you could do with .pck/.zip
Describe how this feature / enhancement will help you overcome this problem or limitation:
There would be no need for my mod framework to repack folder deltas into .zip, just so there would be a workaround for loading the latest version of the WIP mod into the core game's filesystem.
Is there a reason why this should be core and not an add-on in the asset library?:
This greatly accelerates the development of things, that in some games could be loaded procedurally. I do realize, that the inability to load up the folders could be due to a fact that people would use this as a way-to-go importing mechanism, instead of using proper .zip/.pck importers, but it should just be mentioned in docs that this is only for WIP purposes and nothing else.

[aaronfranke]

To add to this, games could use this for a system like some Steam games have where mods are developed and stored locally as a folder, but are packed into a ZIP when uploaded to the Steam workshop.