Feature: add {pocket} support for MSX

[dirn]

No description provided.

[dirn]

There is an MSX core available at https://github.com/opengateware/computer-msx.

[github-actions]

👋 Welcome

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[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:dirn/igir#pocket-msx" [commands..] [options]

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