Add functionality to export raw ITM trace

[tmplt]

A lot of malformed packets are observed on my end when using an STLink probe (to a stm32f401retx). I recall there being less problems when a TTY source was used in conjunction with a SWO pin, thereby bypassing the probe entirely when it comes to tracing. I need to dump the raw trace data so that is may be compared and eventually sent to the vendor for debugging.