Runtime+SVGHMI: Add generic wakeup of threads from PLC thread to windows implementation of plc_main.c. Also added nRT_reschedule to abstract sched_yield.

<?xml version='1.0' encoding='utf-8'?>
<BaseParams xmlns:xsd="http://www.w3.org/2001/XMLSchema" IEC_Channel="1" Name="py_ext_0"/>