[Feature Request]: Add the ability to specify a prefix to PCK content

[DmitriySalnikov]

Feature description

This can be useful when developing mods/addons in the form of separate PCKs for released games, so that you do not have to save the directory structure in the file system. Or you can specify only one of the directories inside the mods SDK.

C:\Game\SDK

C:\Game\SDK\project.godot
C:\Game\SDK\icon.png
C:\Game\SDK\Mods\Base\icon.png
C:\Game\SDK\Mods\Base\mod.json
C:\Game\SDK\Mods\MyMod\icon.png
C:\Game\SDK\Mods\MyMod\mod.json

Using the prefix, it will be possible to specify the root directory for packing C:\Game\SDK\Mods\MyMod, and the prefix Mods\MyMod\.

res://Mods/MyMod/icon.png
res://Mods/MyMod/mod.json

Without the prefix, it would look like this:

res://icon.png
res://mod.json

Or required specifying the root C:\Game\SDK and removing all unnecessary files from the packing list.

Implementation Ideas

Add a prefix TextBox to the packing window.

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Based on a comment by ArcturusForge from itch.io