SoftUART module fixes and code simplification (#3104)
* SoftUART fixes: - Simplify code by using lua_L* functions and using userdata properly - Fix some edge-cases - Add more examples to documentation * Don't de-register interrupt hook if there is more RX instances * More bug fixes and registering simplification with luaL_reref and unref2 * Correct documentation of SoftUART module
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