Translate a stack dump to find return addresses

Usage is ./dump vxWorks.st.2007 device128-dump.dmp
Uses a symbol table from an elf binary.
Add dump limits
Print offsets more clearly.

Show stack relative direction
Show return address as function address + offset
Split loop over bytes from acting on them
Add new tracing methods, data symbols as green
Print a legend to the colors. Organize them in constants
Document usage
Add screenshot