SDL3 Request: Process Spawning

[namandixit]

A wrapper around fork/exec, CreateProcess, etc. to allow launching child processes with arguments. This will make running an application with a server-client architecture (similar to the original Quake) easier.

It's not too much code to do this by oneself, but it'll be good to have a battle-tested version available in SDL (especially given the subtle differences across various platforms).

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Examples:

• https://github.com/DaanDeMeyer/reproc
• https://github.com/eidheim/tiny-process-library
• https://github.com/sheredom/subprocess.h

[hardening]

If we come to abstract this, if that could also include a facility to create communication channels between parent and child (socket pair under unixes and named pipes for windows) as it's a so common model...