Add support for exotic platforms (Windows XP, PS Vita, PSP, 3DS, etc.)

[Darthagnon]

Describe the project you are working on

Godot is an almost universal game engine, but it never had official support for some exotic platforms. Community members have made unofficial ports of Godot to other platforms but these remain as standalone separate projects. It would be nice if they could all be merged into one master project.

Describe the problem or limitation you are having in your project

Redot could differentiate itself from Godot by merging in the export templates and changes needed to support these exotic platforms, and could become a truly universal game engine.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

There are some unofficial ports of Godot to exotic platforms:

• Godot 2.15 for Windows XP
• Godot 3.1 for Windows XP
• Godot 2.16? for PSP
• Godot 3.5rc5 for PS Vita
• Godot 2.1.7 for 3DS
• Unfinished legacy Godot 2.1 port for 3DS ,
• Unfinished Godot 4 port for 3DS

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Rough workflow: pull request from the various projects linked (above), adjust and merge.

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

N/A

Is there a reason why this should be core and not an add-on in the asset library?

I'm not sure console homebrew export templates (and possible engine tweaks) can be added as assets. Currently, they're standalone forks of Godot at various points in history.