Merge branch 'feature/openocd-freertos-support_try2' into 'master'

Add symbol needed for OpenOCD to detect FreeRTOS, add feature to break execution, try 2

Add symbol needed for OpenOCD to detect FreeRTOS, add optional feature to break execution when the scheduler is initially started. The workflow is now so that if you start an esp-idf program, you can reset the CPU and end up in a gdb prompt just before all threads start up. In gdb you can then inspect all threads and watch breakpoints. Has the nice side effect that OpenOCD will restore any break/watchpoints that were there before you reset the chip.

This is try 2 because seemingly, someone or something replaced the bit of my brain that is responsible for handling Git with a squeaky toy.

See merge request !24