Add stable signal restart path and optional config-file overlay

[sickgreg]

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[tipoman9]

@sickgreg
I managed to reproduce the problem on ssc30kq. It does crash usually after 5 to 10 restarts.
The problem reproduces only when Air-side rendering is enabled, and only on Star6e-family cameras (SSC30KQ).
Initially I suspected the RGN stack provided by OpenIPC (I previously hit a similar problem while porting Star6C).
To rule that out, I replaced OpenIPC’s components with the stock SSC30KQ firmware versions of libmi_xxx.so and mi_xxx.ko.
The system behaved the same...
Next, I tested using a separate reference project https://github.com/OpenIPC/osd (the same one I previously used to copy the correct RGN usage).
I cloned it, ran it, drew content on screen, then exited. It crashes in the exact same way, even only 2 to 4 restarts, with similar screen artifacts...
At this point it looks like the issue is not specific to this codebase, but something in the Star6e Air-side rendering / RGN path itself (or its interaction with the platform).
So I’m pausing further work on it for now...
test_msp.sh
test_osd.sh