Justin C. Miller 1cb8f1258d [testapp] Re-add testapp to default manifest ...

This commit re-adds testapp to the default manifest and does some
housecleaning on the module:

- Remove the old serial.* and io.*
- Update it to use current syscall APIs
- Update it to use libj6's higher-level thread API

2023-02-08 22:44:05 -08:00

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