Maintain virtual MuranoPL stack trace

Adds information to executing MuranoPL context that allows
to get currently executed method and instruction with its
location within source YAML file.

All this information can be collected to one stack trace using
stackTrace() function and string-formatted using formatStackTrace()

Change-Id: Ic0aa4e0b2a87d71f76945feb749ecfb0f5a0d299
Implements: blueprint muranopl-stack-traces
Merge "Maintain virtual MuranoPL stack trace"