Allow downloading individual export template TPZ files for each platform

[ViktorEvil]

Describe the project you are working on:
HeartBeast 1-bit course

Describe the problem or limitation you are having in your project:
Have to download export templates that I do not need / want

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
could we have the option to select individual export templates instead of the entire package. As Godot gets more advanced this Export template package is getting larger. Individual templates would reduce bandwidth on the server.

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
Display a list of all export templates available then put a tick by the needed templates

If this enhancement will not be used often, can it be worked around with a few lines of script?:
I envision it would be used a lot

Is there a reason why this should be core and not an add-on in the asset library?:
I do not think that anybody using Godot requires all export templates available

[Calinou]

Related to #35.

I'm willing to make the required UI changes, but this requires the export template packaging to be modified so each TPZ file contains only one platform. However, I have no control over it.

Old Godot versions will have to keep the old packaging scheme, but Godot 4.0 onwards should use the new per-platform packaging scheme.

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[Calinou]

@me2beats Please don't bump issues without contributing significant new information. Use the 👍 reaction button on the first post instead.